Biology Sitemap - Page 1 2016-09-26

Cell Division
Learn about the process of cellular division in plant and animal cells. See diagrams and images of cells in various stages of meiosis and mitosis.

Biology Games and Quizzes
Try these biology games and quizzes and find out how much you really know about biology.

Biological Weapons - Description and Potential List
Biological weapons are toxic materials derived from pathogenic organisms for the purpose of killing or incapacitating a host.

Cytoskeleton: Anatomy, Function, and Structure
The cytoskeleton is a complex network of fibers that function in cell support and movement. It shapes the cell and holds organelles in place.

About Biology: Human Anatomy, Genetics, and Quizzes
Get started with biology as we explore topics of human and cell anatomy, systems, and structures that make up the organisms of our world.

Basic Parts of the Brain and Their Responsibilities
The brain is one of the largest and most important organs of the human body. It sends messages to and receives messages from all over the body.

Brain
Fin information and resources pertaining to the anatomy of the brain.

Basal Ganglia Function and Structures
The basal ganglia are a group of neurons below the cerebral cortex that are mainly involved in motor function and the planning of directed movement.

Biology Word Dissections - Understanding Science Terms
Difficult biology words and terms can be made easy to understand by becoming familiar with common prefixes and suffixes used in biology.

How to Make a DNA Model Using Candy
Constructing DNA models is an excellent way to learn about the structure of DNA. Discover a fun way to make a DNA model using candy.

Heterozygous - A Genetics Definition
Heterozygous refers to having different alleles for a gene. Diploid organisms have two alleles for a gene that determine specific traits.

Genetics
Resources and information to help you understand genetics. Find information on genes, chromosomes, reproduction and more.

Animal Name Games
Play these games and learn the names of various animals and animal groups.

What Are the Six Kingdoms of Life?
Living organisms are classified into one of six Kingdoms of life. They are placed into these categories based on common characteristics.

Evolution
Evolution and paleontology information and resources.

Heart
Information and resources pertaining to the anatomy of the heart.

Heart Nodes - Sinoatrial and Atrioventricular
Heart nodes are specialized tissues that behave as both muscle and nervous tissue. The sinoatrial node and the atrioventricular node control electrical impulses in the heart.

Plant Biology
Information on plants, plant biology, plant viruses, and more.

Pericardium - Anatomy of the Heart
The pericardium of the human heart is a membranous sac that surrounds and protects the heart. It is divided into fibrous, parietal, and visceral layers.

Organ Systems in the Human Body
The human body is made up of several organ systems that work together as one unit. These systems are important for proper organism function.

Muscle Tissue - Cardiac, Skeletal, and Smooth
Muscle tissue is the most abundant tissue type in most animals. The three types of muscle tissue in the body are cardiac, smooth, and skeletal muscle.

Translation: Making Protein Synthesis Possible
Protein synthesis is accomplished through a process called translation. In translation, RNA and ribosomes work together to produce proteins.

Protein Synthesis - Translation, Part 2 (Biology)
Protein synthesis is accomplished through a process called translation. In translation, RNA and ribosomes work together to produce proteins. Page 2.

What Is the Three Domain System?
The Three Domain System is a system for classifying biological organisms. Under this system, organisms are classified into three domains and six kingdoms.

What Is the Cingulate Gyrus?
The cingulate gyrus is a fold in the brain that lies above the corpus callosum. This limbic system structure is involved in processing emotions.

Stages of Mitosis and Cell Division
This guide to the phases of mitosis explores hows cells reproduce. In mitosis, chromosomes are duplicated and divided evenly between two cells.

Stages of Mitosis: Prophase Overview
A stage-by-stage guide to the phases of mitosis. In prophase, the chromatin condenses into discrete chromosomes and spindle fibers form at opposite poles of the cell.

Stages of Mitosis - Daughter Cells
This guide to the phases of mitosis explores cell division. Mitosis produces two identical daughter cells.

Stages of Mitosis: Metaphase Overview
A stage-by-stage guide to the phases of mitosis. In metaphase, the spindle fully develops and the chromosomes align at the metaphase plate.

Stages of Mitosis: Anaphase Overview
A stage-by-stage guide to the phases of mitosis. In anaphase, the paired chromosomes separate and begin moving to opposite ends of the cell.

Stages of Mitosis - Telophase Overview
A stage-by-stage guide to the phases of mitosis. In telophase, the chromosomes are cordoned off into distinct new nuclei in the emerging daughter cells.

Mitosis
Information on mitosis and the process of mitotic cell division.

Anaphase
Onion root tip image in anaphase of mitosis. Page 4.

Prophase
Onion root tip image in early prophase of mitosis. Page 2.

Early Telophase
Onion root tip image in early telophase of mitosis. Page 5.

Interphase
Onion root tip image in interphase of mitosis.

Late Telophase
Onion root tip image in late telophase. Page 6.

Metaphase
Onion root tip image in metaphase of mitosis. Page 3.

Ecology
Information on ecology and ecological topics including endangered animals and land biomes.

Microbiology
A plethora of information and resources pertaining to microbiology, bacteriology, and virology. Find information on cells, bacteria, viruses and other microbes.

Digestive Enzymes and Nutrient Absorption
Most nutrients are absorbed in your body through the small intestines. These nutrients are delivered to cells through the circulatory and lymph systems.

What Are Alleles? - Definition of Biology Terms
An allele is an alternative form of a gene (one member of a pair) that determines specific traits.

Heterozygous Traits
Credit: Steve Berg An organism that is heterozygous for a trait has two different alleles for that trait. An allele is an alternative form of a gene (one

Biology Prefixes and Suffixes: cyto-, -cyte
Biology prefixes and suffixes are useful for understanding biology terms. The prefix (cyto-) and suffix (-cyte) refer to a cell.

Biology Prefixes and Suffixes: dactyl-, -dactyl
Biology prefixes and suffixes help us to understand biology terms. The affix dactyl denotes a digit such as a finger or toe.

Blood Cells
Our blood transports substances to and from our cells and provides immunity and protection against infectious agents. Explore the cells of the blood including red blood cells, white blood cells, platelets.

Heart Wall: Epicardium, Myocardium, and Endocardium
The layers of the heart wall consist of the outer epicardium, the middle myocardium, and the inner endocardium. Cardiac muscle powers heart contractions.

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Biology Questions and Answers
Have you ever wondered why some sounds make you cringe or why DNA has a twisted shape? Discover answers to these and other common biology questions.

Biology Prefixes and Suffixes: -plasm, plasmo-
Biology prefixes and suffixes help us to decipher biology terms. The affix plasm refers to living material or matter forming cells.

Biology Prefixes and Suffixes: staphylo-, staphyl-
Biology prefixes and suffixes help us to understand biology terms. The prefix (staphylo-) or (staphl-) refer to having a clustered shape.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Weird Facts About Snakes
Snakes are unique reptiles that most try to avoid. Some have unusual features that are flat out strange. Discover 7 weird facts about snakes.

7 Facts About Viruses
A virus is a microscopic agent of disease that has characteristics of both life and non-life. Discover 7 interesting facts about viruses.

5 Parasites That Turn Animals Into Zombies
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5 Parasites That Turn Animals Into Zombies
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5 Parasites That Turn Animals Into Zombies
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5 Parasites That Turn Animals Into Zombies
Some parasites infect animals and change their host's brain function and behavior. Discover 5 parasites that can turn animal hosts into zombies.

5 Parasites That Turn Animals Into Zombies
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Slowest Animals on the Planet
How do very slow animals survive in the wild? Are there benefits to living life in the slow lane? Discover five of the slowest animals on the planet.

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Animals That Mimic Leaves
Some animals camouflage themselves as leaves to avoid predators or catch prey. The next time you pick up a leaf, make sure it is not a leaf impostor.

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Diseases You Can Catch From Your Pet
Pets are often infected with germs and parasites that can be transmitted to people. Discover common diseases that can be spread by pets to humans and ways to prevent pet-related diseases.

Diseases You Can Catch From Your Pet
Pets are often infected with germs and parasites that can be transmitted to people. Discover common diseases that can be spread by pets to humans and ways to prevent pet-related diseases.

Diseases You Can Catch From Your Pet
Pets are often infected with germs and parasites that can be transmitted to people. Discover common diseases that can be spread by pets to humans and ways to prevent pet-related diseases.

Biology
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Diseases You Can Catch From Your Pet
Pets are often infected with germs and parasites that can be transmitted to people. Discover common diseases that can be spread by pets to humans and ways to prevent pet-related diseases.

Diseases You Can Catch From Your Pet
Pets are often infected with germs and parasites that can be transmitted to people. Discover common diseases that can be spread by pets to humans and ways to prevent pet-related diseases.

Diseases You Can Catch From Your Pet
Pets are often infected with germs and parasites that can be transmitted to people. Discover common diseases that can be spread by pets to humans and ways to prevent pet-related diseases.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

The Fastest Animals on the Planet Revealed
What are the fastest animals on the planet? These swift animals reach amazing speeds on land, in the air, and in the ocean.

Top 7 Bugs That Feed on Humans
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Mosquitoes
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Bed Bugs
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Fleas
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Ticks
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Lice
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Mites
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Flies
There are a number of bugs that feed on humans. These bugs are resilient, gaining immunity to insecticides, and out for your blood.

Mendel's Law of Independent Assortment
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes.

Nucleus - Definition and Related Terms
The nucleus is a cell structure that contains hereditary information, or DNA, and controls cellular growth and reproduction.

Sexual Reproduction: Types of Fertilization
Fertilization involves the union of male and female sex cells, which results in the production of offspring with a mix of inherited genes.

Land Biomes - Tropical Rain Forests
Tropical rain forests are characterized by dense vegetation, seasonally warm temperatures, and abundant rainfall.

Land Biomes: Taigas
Taigas, also called boreal forests, are the world's largest land biome. These forests of dense evergreen trees extend across North America, Europe, and Asia.

Tundra Land Biome Description and Characteristics
The tundra biome is characterized by extremely cold temperatures and treeless, frozen landscapes.

Online Dissections: Photos, Tutorials, and More
Online dissections allow you to experience actual dissections without all of the mess.

10 Things You Don't Know About Fat
Did you know that there are billions of fat cells in the body and that fat tissue actually helps to protect against obesity? Discover some interesting facts you may not know about fat.

Genotype
Genotype refers to the genetic composition of an organism. Genotype is inherited through sexual reproduction and determines our characteristics.

Mendel's Law of Segregation
Mendel's Law of Segregation states that allele pairs separate during gamete formation, and randomly unite at fertilization.

Can Animals Sense Natural Disasters?
A tsunami spawned by an earthquake in the Indian Ocean caused massive destruction in Asia and East Africa in 2004. Wild animals however, were able to survive. Did they sense the disaster before it hit?

How to Take Biology Notes
Here are some good biology note taking tips that are sure to help you learn how to take biology notes.

Biology Science Fair Project Ideas
Here are some great ideas for biology science fair projects including projects related to animals, plants and the human body.

The Nucleus - Structure and Function
The cell nucleus is the command center of our cells. It contains our chromosomes and genetic information needed for the reproduction of life.

Eukaryotic Cell Anatomy Quiz
Do you know which cellular structure houses DNA? Test your knowledge of eukaryotic cell anatomy. Take the Cell Anatomy Quiz.

Organ Systems Quiz - Organs of the Body Quiz
The organ systems of the body work as one unit to keep the body functioning properly. Test your knowledge of body systems. Take the Organ Systems Quiz!

Snake Venom and Stroke
Snake venom can reverse the effects of a stroke and may even help in the treatment of heart disease and cancer.

10 Facts About Pollen
Did you know that not all types of pollen trigger allergies or that not all pollen is yellow? Discover 10 facts about pollen that may surprise you.

Plant Leaves and Leaf Anatomy
Leaves are the sites of photosynthesis in plants. They come in various shapes and are vital for food production and the cycle of carbon and oxygen.

What Lightning Does to Your Body
Lightning displays a combination of power and heat that can cause serious damage if it strikes you. Discover the causes of lightning strikes and how lightning damages the body.

Mitosis Image Gallery
View images of onion cells in several phases of mitosis.

Stages of Meiosis
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Prophase I
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Metaphase I
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Anaphase I
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Telophase I
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Prophase II
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Metaphase II
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Anaphase II
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis Telophase II
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

Stages of Meiosis: Daughter Cells
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis I and meiosis II.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

Independent Assortment
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes. Therefore, traits are transmitted to offspring independently of one another.

Independent Assortment
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes. Therefore, traits are transmitted to offspring independently of one another.

Independent Assortment
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes. Therefore, traits are transmitted to offspring independently of one another.

10 Everyday Objects That Harbor Germs
Germs are ubiquitous, populating almost every place on the planet. Common objects we use every day are often havens for bacteria, viruses, and other germs.

Five Dangerous Superbugs
Superbugs are antibiotic-resistant germs that cause serious infections. Discover five dangerous superbugs and learn how to protect yourself from them.

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5 Types of Bacteria That Live on Your Skin
Our skin is home to billions of bacteria. While most species of skin bacteria are harmless and may even provide protective benefits, others can pose serious health problems.

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Cute Features Caused by Gene Mutations
Did you know that cute features such as dimples and freckles are caused by gene mutations? These traits can either be inherited or acquired.

8 Types of White Blood Cells
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

Dendritic Cells
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

Neutrophils
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

Ear Anatomy
Our ears are help us to hear and to maintain balance. Sound vibrations travel from the outer ear, through the middle ear, and to the inner ear where they are converted to nerve signals.

B Cells
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

T Cells
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

Natural Killer Cells
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

Eosinophils
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

Basophils
White blood cells protect the body from germs and damaged cells. Learn about the 8 types of white blood cells that safeguard the body against pathogens.

What Are Platelets?
Platelets, or thrombocytes, are blood components that are vital to the blood clotting process. Activated platelets are round and sticky with long, finger-like projections which extend from the cell.

7 Major Types of Algae
Algae are protists that range in size from the very small nanoplankton to the giant kelp. Algae are typically found in marine and freshwater habitats.

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The Pineal Gland of the Endocrine System
The pineal gland is a small gland of the endocrine system that produces the hormone melatonin. This gland controls sleep-wake cycles.

Overview of Stem Cells
Stem cells are unique cells of the body in that they are unspecialized and have the ability to develop into several different types of cells.

Types of Stem Cells - Biology Slideshow
Stem cells are unique cells of the body in that they are unspecialized and have the ability to develop into several different types of cells. Page 2.

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8 Surprising Things You Didn't Know About Bacteria
Did you know that bacteria influence weather by causing rain and other types of precipitation? Discover 8 surprising things you didn't know about bacteria.

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Spirochetes Bacteria
Bacteria come in a number of shapes and sizes. They can be round, shaped like rods, or even shaped like a comma. Learn to identify three common bacteria shapes.

Bacteria Shapes
Bacteria come in a number of shapes and sizes. They can be round, shaped like rods, or even shaped like a comma. Learn to identify three common bacteria shapes.

Cocci Bacteria
Bacteria come in a number of shapes and sizes. They can be round, shaped like rods, or even shaped like a comma. Learn to identify three common bacteria shapes.

Bacilli Bacteria
Bacteria come in a number of shapes and sizes. They can be round, shaped like rods, or even shaped like a comma. Learn to identify three common bacteria shapes.

Spirilla Bacteria
Bacteria come in a number of shapes and sizes. They can be round, shaped like rods, or even shaped like a comma. Learn to identify three common bacteria shapes.

Vibrio Bacteria
Bacteria come in a number of shapes and sizes. They can be round, shaped like rods, or even shaped like a comma. Learn to identify three common bacteria shapes.

Differences Between Bacteria and Viruses
Do you know the difference between bacteria and viruses? While both are infectious agents capable of causing disease, they are very different microbes.

Biology Dictionary
Resources for finding the definitions of common biology related terms.

Homework Help
Resources and information on on biology homework help, biology lesson plans, online dissections, and biology lab How-tos.

Biology - Basics, Characteristics of Life and Principles
What is biology? Simply put, it is the study of life. Discover the basic principles of biology and the characteristics of life.

What Is the Cerebral Cortex?
The cerebral cortex is the outer covering of the cerebrum. It is the layer of the brain often referred to as gray matter.

Tissues
Explore the four main categories of tissues found in the body. These tissues include epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

Red Blood Cells - Function and Structure
Red blood cells are blood components that transport oxygen throughout the body. These cells contain millions of oxygen-binding hemoglobin molecules.

Red Blood Cells
Red blood cells are blood components that transport oxygen throughout the body. Also called erythrocytes, these cells contain hundreds of millions of oxygen-binding hemoglobin molecules.

Pons - Brainstem and Hindbrain
The pons serves as a communications and coordination center between the two hemispheres of the brain. It connects the medulla to the cerebral cortex.

Four Cerebral Cortex Lobes of the Brain
The cerebral cortex lobes include the parietal, frontal, occipital and temporal lobes. They are responsible for processing input from various sources.

Organ Systems
Information on the organ systems of the human body including the cardiovascular, immune, and digestive systems.

Nervous System
The nervous system consists of the brain, spinal cord, and a complex network of neurons.

Digestive System
The digestive system functions to break-down food in order to absorb the nutrients needed for energy and proper cell function.

Integumentary System
The integumentary system consists of the largest organ in the body, the skin. This organ protects the internal structures of the body from damage.

Integumentary System - The Skin Layers
The integumentary system consists of the largest organ in the body, the skin. This organ protects the internal structures of the body from damage.

The Hippocampus in the Limbic System
The hippocampus is the part of the brain that is involved in memory formation, memory organization, and memory storing. It is a limbic system structure.

Gametes - Definition of Biology Terms
Gametes are reproductive cells that unite at fertilization to form a new cell called a zygote. Gametes are haploid cells formed by meiosis.

Differences Between Animal Cells and Plant Cells
Plant and animal cells are similar in that both are eukaryotic cells. However, there are several important differences between these two cell types.

Virology
Find information and resources pertaining to viruses such as Ebola.

6 Steps of Virus Replication
In order for virus replication to occur, a virus must infect a cell and use the cell's organelles to generate new virus particles.

Virus Replication: Bacteriophage
Learn about virus replication and how viruses infect cells.

Virus Replication: Bacteriophage
Learn about virus replication and how viruses infect cells.

Virus Replication: Bacteriophage
Learn about virus replication and how viruses infect cells.

Virus Replication: Bacteriophage
Learn about virus replication and how viruses infect cells.

Virus Replication: Bacteriophage
Learn about virus replication and how viruses infect cells.

Virus Replication: Bacteriophage
Learn about virus replication and how viruses infect cells.

Cell Biology
Discover the fascinating world of cells. Take a journey into the cell and learn about various cell types, cellular anatomy, and cellular processes.

Different Cell Types in the Body
The body contains trillions of cells that come in varying shapes and sizes. Explore some of the different types of cells in the body.

Anatomy of the Brain: Structures and Their Function
This resource provides information on brain anatomy, brain divisions, cranial nerves, the central nervous system, and brain function.

Olfactory System - Sense of Smell
The olfactory system enables us to detect odors. Our sense of smell involves nerves, the brain, and sensory organs such as the nose and olfactory bulbs.

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Respiratory System: How We Breathe
The respiratory system is the organ system that enables us to breathe. Respiratory structures include the nasal passages, trachea, lungs, and diaphragm.

Bone Marrow - Structure, Function, Disease and More
Bone marrow is the soft tissue found inside bones that functions mainly to produce red blood cells, white blood cells, and platelets.

Bone Marrow - Structure, Function, Disease and More
Bone marrow is the soft tissue found inside bones that functions mainly to produce red blood cells, white blood cells, and platelets.

Bacterial Reproduction - Binary Fission
Bacterial reproduction most commonly occurs by a kind of cell division called binary fission. This type of asexual reproduction produces identical cells.

Prokaryotes - Prokaryotic Cells
Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. Prokaryotes include bacteria and archaeans.

Binary Fission in Prokaryotes - Single-Celled Organisms
Most prokaryotes reproduce asexually through a process called binary fission. Page 2.

Cellular Respiration - Glycolysis, Citric Acid Cycle
Cellular respiration is a process by which cells harvest the energy stored in food. It includes glycolysis, the citric acid cycle, and electron transport.

Biological Polymers - Proteins, Carbohydrates, Lipids
Biological polymers are large molecules composed of many smaller molecules linked together. Proteins and nucleic acids are two examples of polymers.

15 Objects Commonly Left Inside the Body After Surgery
Each year, thousands of patients leave the hospital with surgical objects still inside their bodies. Some of these objects include sponges and scissors.

Chromosome Mutation
A chromosome mutation causes changes in the structure or number of chromosomes in a cell. These mutations are often caused by errors that occur during the process of cell division or by mutagens.

Lipids (Fats, Phospholipids, Steroids and Waxes)
Lipids are diverse compounds that are insoluble in water. They store energy, protect against water loss, and form cell membranes.

Homologous Chromosomes - A Genetics Definition
Homologous chromosomes are chromosome pairs that are inherited from each parent. They are similar in gene position but may contain different alleles.

Types of Plant Cells
Specialized plant cells include parenchyma cells, collenchyma cells and sclerenchyma cells. Some cells store nutrients, while others support the plant.

Chromosome Definition and Description
A chromosome is a long, stringy aggregate of genes that carries heredity information and is formed from condensed chromatin.

Medulla Oblongata
The medulla oblongata is a portion of the hindbrain that controls autonomic functions such as breathing, digestion and heart rate.

Biotechnology/Cloning
Resources that provide a comprehensive look into biotechnology and cloning issues.

Anatomy of the Heart - Diagram View
The heart is the organ that helps supply blood and oxygen to all parts of the body. Heart anatomy focuses on the structure and function of the heart.

Anatomy of the Heart - Organ Diagram View
The heart is the organ that helps supply blood and oxygen to all parts of the body. The heart and the circulatory system together form the cardiovascular system. Page 2.

Atria of the Heart Function
Atria are the upper chambers of the heart. They receive blood returning to the heart from other areas of the body and send blood to the heart ventricles.

Digestive System - Organs and Digestion
The digestive system processes the foods we eat to provide nutrients for the body. Discover more about food digestion and nutrient absorption.

Production of Digestive Juices
Information about food digestion and the human digestive system, including digestive glands, and production of digestive juices. Page 2.

What are Sinusoids in Organs?
Sinusoids are small vessels found in certain organs. Sinusoids have large pores that allow blood cells and molecules to pass through their thin walls.

Spleen Anatomy and Function
The spleen performs the valuable function of filtering blood of pathogens and diseased cells. The spleen also stores red blood cells and platelets.

Human Liver Anatomy and Function
The liver is an important organ that performs hundreds of essential functions in the body. This organ aids in nutrient metabolism and detoxification.

How to Write a Bibliography For a Science Fair Project
It is important to keep a record of all the sources you use in your science fair project research. This information will be listed in your bibliography.

Biology and Anatomy Games and Quizzes
Biology games and quizzes help you to test your knowledge of biology in a fun way. Discover how much you know about the human body, genetics, and more.

Take the Cellular Respiration Quiz
Cellular respiration provides the energy needed to power cells. Find out how much you know about this process by taking the Cellular Respiration Quiz.

Human Brain Quiz - How Well Do You Know Brain Anatomy?
Test your knowledge of human brain function and anatomy. Take the Human Brain Quiz and discover how much you really know about the brain.

Mesencephalon - Midbrain Function and Structures
The mesencephalon or midbrain is the portion of the brainstem that connects the hindbrain and the forebrain. The midbrain regulates movement.

Biology Science Fair Projects
Resources and ideas for creating wining biology related science fair projects. Find information on science fair books, models, and more.

Chromatid - Biology Glossary Definition
A chromatid is one-half of two identical copies of a replicated chromosome. Chromatids are separated during mitosis and divided between two cells.

Pancreas Anatomy and Function
The pancreas is an endocrine system organ that secretes digestive enzymes and also produces hormones to control metabolism.

How To Streak a Bacterial Culture
This step-by-step procedure demonstrates how to isolate bacterial colonies by using the streaking method. Bacteria are spread across an agar plate.

Amoeba Anatomy, Digestion, and Reproduction
Amoebas are amorphous, jelly-like organisms that live in soils and aquatic habitats. They constantly change shape and exhibit a unique form of motion.

How to Extract DNA From a Banana
Try this simple experiment that demonstrates how to extract DNA from a banana. The process involves mashing, filtration, precipitation, and extraction.

Photosynthesis Quiz and Photosynthetic Organisms
Did you know that plants are not the only organisms capable of photosynthesis? Test your knowledge of photosynthesis. Take the Photosynthesis Quiz!

Biology
Biology.

The Best and Worst Fathers in the Animal Kingdom
Fatherhood is an important responsibility, even in the animal kingdom. Discover which animal fathers are among the best and the worst.

Biology
Biology.

Biology
Biology.

Biology
Biology.

Biology
Biology.

Biology
Biology.

Biology
Biology.

Biology
Biology.

Top Five Reasons to Wash Your Hands
Washing and drying your hands properly is a simple and effective way to remove bacteria and other dangerous germs and to prevent the spread of disease.

Zoology
Information and resources pertaining to the study of animals. Learn about various animal species.

Mitosis Quiz on Mitotic Cell Division
Mitosis is the cell division process by which organisms grow. Take this Mitosis Quiz and find out how much you know about mitotic cell division.

Pituitary Gland - Function and Hormone Production
The pituitary gland is a small endocrine system organ that controls a number of important functions in the body. It is sometimes called the Master Gland.

Diencephalon - Overview, Function, and Pictures
The diencephalon, along with the telencephalon comprise the two major divisions of forebrain. The thalamus is a major component of the diencephalon.

Genes Definition - Biology Glossary
Genes are segments of DNA located on chromosomes. Genes are inherited from our parents and contain the codes for the production of specific proteins.

Wernicke's Area in the Brain
Wernicke's area of the brain is responsible for helping us to understand language. It is found in the temporal lobe and connected to Broca's area.

Why Biology Lab Safety Rules Are Important
Biology lab safety rules are guidelines designed to help keep you safe when experimenting. It is always wise to follow all lab safety rules.

Journey into the Cell: Cilia and Flagella
Cilia and flagella are finger-like projections that extend from some cells. They aid in cell movement and help to move substances around cells.

Animal Tissues: Epithelial Tissue
Epithelial tissue covers the outside of the body and lines organs, vessels, and cavities. Epithelial cells are very closely packed together.

Epithelial Tissue: Simple Epithelium
Simple epithelium consists of a single layer of epithelial cells. Page 2.

Epithelial Tissue: Stratified Epithelium
Stratified epithelium consists of epithelial cells stacked in multiple layers. Page 3.

Epithelial Tissue: Pseudostratified Epithelium
Pseudostratified epithelium appears to be stratified, but is not. All cells are in contact with the basement membrane. Page 4.

Common Animal Questions and Answers
Why do zebras have stripes? Why do some tigers have white coats? Find answers to these and other commonly asked questions about animals.

Using Plants in Science Experiments - List of Ideas
The following project ideas using plants provide suggestions for topics that can be explored through experimentation.

Sex Chromosome Abnormalities
Sex chromosome abnormalities occur as a result of chromosome mutations brought on by mutagens or problems that occur during meiosis.

Nervous System: Peripheral Nervous System
The peripheral nervous system relays signals between the central nervous system and the other parts of the body through sensory and motor neurons.

Connective Tissue Types and Examples
Connective tissue supports and binds other tissues of the body. Examples of connective tissue include adipose, cartilage, bone, tendons, and blood.

7 Facts About the Zika Virus
The Zika virus is an RNA virus that is spread most often by mosquitoes. It causes Zika disease, which can result in birth defects and nerve damage.

The Cell - Prokaryotic and Eukaryotic Cells
Take a journey into the cell to find out about the cell structure and classification of both prokaryotic cells and eukaryotic cells.

Meiosis
Information on meiosis and the process of meiotic cell division.

Meiosis Study Guide, Overview and Diagrams
This meiosis study guide introduces you to the basics of meiosis and the meiotic process. Sex cells are produced through this two stage process.

Genetics Basics: Introduction to Genetics
Find resources that help explain the basics in this study of heredity or inheritance -- how traits are passed from parents to their young.

7 Differences Between Mitosis and Meiosis
Cells divide either through the process of mitosis or meiosis. Sex cells are produced through meiosis, while all other body cell types are produced through mitosis.

Anatomy of the Brain - Cerebrum
The cerebrum is the largest portion of the brain. It encompasses about two-thirds of the brain mass and lies over and around most brain structures.

Frontal Lobes in the Cerebral Cortex
The frontal lobes are one of the four main lobes or regions of the cerebral cortex. They are responsible for the planning of complex cognitive behaviors.

Biology
Biology.

Divisions of the Brain - Forebrain, Midbrain, Hindbrain
The brain can be divided into three major divisions: forebrain, midbrain, and hindbrain. Each division is involved in sending and receiving information.

Biology
Biology.

Top Biology Programs - East and Central US
Find a listing of the top biology and biological sciences programs from colleges and universities in the United States.

Effects on the Body of an Alcohol Hangover
Drinking too much alcohol can lead to alcohol hangover. Learn about alcohol hangover symptoms and how to prevent hangover. Page 2.

Alcohol Hangover Biology, Physiology and Preventions
Drinking too much alcohol can lead to alcohol hangover. Learn about alcohol hangover symptoms and how to prevent hangover.

Alcohol Hangover
Learn about alcohol hangover symptoms, how to prevent them, and various hangover remedies. Page 3.

Top Biology Programs
The top biology programs from colleges and universities by region in the United States, including universities in the West and Pacific. Page 2.

The Anatomy of Neurons: Human Biology
All cells of the nervous system are comprised of neurons. Neurons are responsible for sending, receiving, and interpreting information.

Nervous Tissue: Neurons and Glial Cells
Nervous tissue is the primary tissue of the central and peripheral nervous systems. Nervous tissue conducts nerve impulses and is composed of neurons.

Spices Kill Bacteria and Have Other Heath Benefits
Scientific studies indicate that spices kill bacteria. Spices including cinnamon and garlic can effectively control bacteria in foods and liquids.

Sexual Reproduction - Gametes and Fertilization
Sexual reproduction is a process by which two individuals produce offspring with genetic traits from both parents. It involves the union of gametes.

Broca's Area in the Cerebral Cortex
Broca's area is one of the main areas of the cerebral cortex responsible for producing language. It controls motor functions involved with speech.

Cell Membrane - A Cell Biology Definition
The cell membrane is a thin semi-permeable membrane that surrounds the cytoplasm of a cell, enclosing its contents. It protects and supports the cell.

Brainstem (Human Anatomy): Function and Location
The brainstem is the region of the brain that connects the cerebrum with the spinal cord. It consists of the midbrain, medulla oblongata, and the pons.

Chloroplast Function in Plant Cell Structure
A chloroplast is a chlorophyll containing organelle found in plant cells and some algae. They convert light energy into chemical energy by photosynthesis.

Photosynthesis - Equation and Stages
Photosynthesis is a process in which light energy is used to produce sugar and other organic compounds. Photosynthesis occurs in plant leaves.

The Thyroid Gland in the Endocrine System
The thyroid gland and associated parathyroid glands are endocrine system structures that regulate vital processes in the body through the secretion of hormones.

Biology
Biology.

Biology
Biology.

Biology
Biology.

Photosynthetic Organisms - Plants, Algae, Cyanobacteria
Photosynthetic organisms are capable of generating organic compounds through photosynthesis. These organisms include plants, algae, and cyanobacteria.

Temporal Lobes in the Cerebral Cortex
The temporal lobes, one of four cerebral cortex lobes, play an important role in organizing sensory input, auditory perception, and memory formation.

Occipital Lobes in the Cerebral Cortex
The occipital lobes are positioned at the back area of the brain. These cerebral cortex lobes are the main centers for visual processing.

Adipose Tissue - Composition, Location, and Function
Adipose tissue is a type of connective tissue composed of fat storing cells that harvest and utilize the energy in fats. White adipose tissue stores energy and helps to insulate the body, while brown adipose and beige adipose burn energy and generate heat.

Cell Wall - Structure and Function
The cell wall is the rigid, semi-permeable protective layer found in some cells.

Types of Spooky & Unusual Plants
This is the time of year when you may want to be on the lookout for white ghosts and vampires. No, I don't mean evil spirits. I am referring to some spooky plants that have very interesting characteristics.

Phospholipids - Biological Polymers
Phospholipids belong to the lipid family of biological polymers. A phospholipid is composed of two fatty acids, a glycerol unit, a phosphate group and a polar molecule.

Nucleic Acids - Types, Structure, and Function
Nucleic acids are organic molecules that allow organisms to transfer genetic information from one generation to the next. DNA and RNA are the two types of nucleic acids.

What are Polar Fibers in Cells?
Definition of the term polar fibers.

Cytokinesis in a Cell Cycle
In cytokinesis, the cytoplasm of a dividing cell is split into equal portions and distributed between two daughter cells. This process occurs at the end of the cell cycle.

What is the Cell Cycle Process?
Cells grow and divide through a process known as the cell cycle.

Asters: Star-Shaped Microtubule Arrays
Asters are star-shaped microtubule arrays found in animal cells. They help to form the spindle apparatus, which moves chromosomes during cell division.

Mammal Species Characteristics
Learn about the characteristics that differentiate mammal species from other vertebrates.

Biome Quiz - Test Your Knowledge
Take the biome quiz and test your knowledge of the land biomes of the world.

What Are Blood Vessels in the Body?
Blood vessels are intricate networks of hollow tubes that transport blood throughout the entire body.

Haploid Cell- Number and Reproduction
A haploid cell is a cell that contains one complete set of chromosomes. Gametes are examples of haploid cells that reproduce by meiosis.

Gene Theory - Basic Principle in Biology
The Gene Theory is one of the basic principles of biology. The main concept of this theory is that traits are passed from parents to offspring through gene transmission.

Diploid Cell: Double the Chromosomes
A diploid cell is a cell that contains two sets of chromosomes. The somatic cells of the body are diploid cells that reproduce by mitosis.

What Determines a Blood Type?
The presence or absence of certain identifiers on the surface of red blood cells determine human blood type.

Nutrient Cycles in the Environment
The nutrient cycle outlines the movement of chemical nutrients in the environment. Examples of these cycles include the carbon cycle and the nitrogen cycle.

The Structures and Organelles in Plant Cells
A plant cell is a eukaryotic cell, meaning that it possesses a membrane-bound nucleus. Learn about the structures and organelles that can be found in typical plant cells.

What Are the Types of Lymphocytes?
Lymphocytes are a type of white blood cell that provide a means for specific and nonspecific immunity. They circulate in blood and lymph fluids and defend the body against cancerous cells, pathogens, and foreign matter.

Organelles - Tiny Cellular Organs
Analogous to the body's internal organs, organelles are tiny cellular organs that are specialized to perform functions necessary for normal cellular operation. Examples of organelles include the nucleus, mitochondria, and ribosomes.

Mitochondria
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell.

Mitochondria - Power Producers in Cells
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell.

Cell Membrane Function and Structure
The cell membrane is a thin, semi-permeable barrier that surrounds and encloses the contents of a cell. It supports and helps maintain a cell's shape.

The Homeostasis Process in Biology
Homeostasis is the ability to maintain a constant internal environment in response to environmental changes.

Double Helix - Structure of DNA
The structure of DNA is that of a double helix. Similar to a spiral staircase, DNA is twisted and coiled so that it can be packed into our cells.

Cell Theory as a Basic Principle of Biology
The Cell Theory is one of the basic principles of biology. It states that all living things are composed of cells and cells are the basic units of life.

Antibiotics - Discovery and Resistance
Antibiotics are drugs or chemicals that are used to kill or hinder the growth of bacteria. Due to the prevalent use of antibiotics, resistant strains of bacteria are becoming much more difficult to treat.

Gene Mutation Causes and Disorders
A gene mutation is any change that occurs in the DNA. These changes can be beneficial to, have some effect on, or be seriously detrimental to an organism.

Phases of the Cardiac Cycle - When the Heart Beats
The cardiac cycle describes the cycle of events that occur when the heart beats. It consists of a diastole phase and a systole phase.

Hypothalamus of the Peripheral Nervous System
About the size of a pearl, the hypothalamus directs a multitude of important functions in the body. It is the control center for many autonomic functions.

Limbic System: Amygdala, Hypothalamus, Thalamus
The limbic system is comprised of brain structures that are involved in our emotions. Structures of this system include the amygdala, hippocampus, hypothalamus, and thalamus.

What Is Apoptosis in Cells?
Apoptosis, or programmed cell death, is a naturally occurring process in the body. Cells that become infected or damaged may need to commit suicide in order to avoid causing harm to other cells.

Binary Fission and Bacterial Reproduction
E. coli undergoing binary fission.Image: Janice Carr/CDC Bacteria are prokaryotic organisms that reproduce asexually. Bacterial reproduction most commonly

Biology Prefixes and Suffixes: cephal-, cephalo-
Biology prefixes and suffixes help us understand terms. The affix cephal- or cephalo- means head. The word cephalalgia is another term for a headache.

Spores - Reproductive Cells
Some organisms use reproductive cells known as spores as a means of asexual reproduction. These cells are produced in plants, fungi, algae, and bacteria.

Biology Lab Reports - Format
If you are taking a biology course, you are going to write biology lab reports. Learn how to use a good lab report format to properly write a lab report.

Amygdala (Definition, Function, Location)
The amygdala is a brain structure responsible for autonomic responses associated with fear and fear conditioning. It processes many of our emotions.

DNA Definition: Shape, Replication, and Mutation
DNA is a type of nucleic acid that contains the genetic information necessary for the production of other cell components and for the reproduction of life.

Centromere Defintition, Function, and Location
A centromere is a region on a chromosome that joins identical sister chromatids. This chromosome segment plays a major role in chromosome movement,

How Steroid Hormones Work
Steroid hormones are molecules that acts as chemical messengers in the body. They are derived from cholesterol and include male and female sex hormones.

Biological Evolution and Genetic Variation
Biological evolution is any genetic change in a population inherited over several generations. These changes may be obvious or not very noticeable at all.

Daughter Cells - Mitosis and Meiosis
Daughter cells are cells derived from a single dividing cell. Two daughter cells result from mitosis, while four cells are produced from meiosis.

8 Basic Tips to Ace Your Biology Class
Need help studying for biology? Follow 8 simple steps will make studying less stressful.

Thalamus Description and Diagram
The thalamus is a limbic system structure that is involved in sensory perception and relaying sensory information to the cerebral cortex.

Ventricular System of the Brain
The ventricular system of the brain is a connected series of cavities that provides a pathway for the circulation of cerebrospinal fluid.

Choroid Plexus: Structure, Function, and Location
The choroid plexus is a mass of vascular tissue in brain ventricles that is responsible for the production of cerebrospinal fluid.

Meninges: Function and Layers
The meninges is a protective covering that surrounds the brain and spinal cord. Problems that impact this membrane can result in serious conditions.

Biology
Biology.

Anatomy of the Brain - Central Sulcus (Fissure of Rolando)
Information and resources pertaining to the central sulcus

Anatomy of the Brain - Fissure of Sylvius (Lateral Sulcus)
Information and resources pertaining to the fissure of sylvius

Biology Prefixes and Suffixes: ana-
Biology prefixes and suffixes help us to understand biology terms. The prefix (ana-) can mean upward, back, again, excessive, or apart.

7 Interesting Facts About Fungi
Did you know that some fungi can glow in the dark? Other types of fungi have even been used to cure disease. Explore seven interesting facts about fungi.

Why Swinging Makes You Fall Asleep Faster
Have you ever noticed that swinging helps you fall asleep faster? Gentle rocking helps us to enter the non-rapid eye movement sleep stage sooner.

7 Ways to Improve Your Cardiovascular Health
Did you know that brushing your teeth twice a day could lower your risk of heart disease? Discover 7 ways to improve your cardiovascular health.

7 Facts About Bacteriophages
Since phage viruses are so efficient at killing bacteria, they are being used to target superbugs. Discover 7 surprising facts about bacteriophages.

5 More Reasons Not to Smoke
Cigarettes contain thousands of chemicals that can be harmful to your body. If that doesn't deter you, here are 5 more reasons not to smoke.

Bugs in Your Christmas Tree
Did you know that your fresh-cut Christmas tree is inhabited by thousands of bugs? Most people unknowingly bring these critters home for the holidays.

Giant Golden Orb Weaver Spiders
Giant golden orb weaver spiders produce the largest orb webs, which can be as large as 3 feet in diameter. The females are 5 times larger than the males.

Can Antibacterial Soaps Make You Sick?
The chemical triclosan, found in some antibacterial soaps and other household products, may compromise the immune system in children and increase the risk for the development of a number of diseases.

B Cells
B cells are immune cells that provide protection against germs through the production of antibodies. These cells provide long lasting protection against specific pathogens and disease.

Fighting Cancer With Viruses
Scientists are engineering viruses that are capable of fighting cancer. These viruses are able to target specific cancer cells while leaving healthy cells unharmed.

HIV Uses Trojan Horse Method to Infect Cells
HIV uses a veil of human proteins, in a Trojan horse manner, to infect immune cells. The virus cloaks itself within a capsid made from viral proteins and proteins from human cell membranes to avoid immune system detection.

T Cells
T cells are white blood cells that actively destroy germs and signal other immune cells to participate in the immune response. T cells protect the body against cancerous cells and virus-infected cells.

Predator vs. Prey: Adaptations
Look carefully at the picture. Can you see the bird hidden in the shrubbery? With predators always on the look out for a meal, prey must employ defense mechanisms to avoid being eaten.

Blood, Components and Blood Cell Production
Blood is the life fluid of the body as it provides nourishment to the cells, tissues, and organs of the body. A component of the cardiovascular system, blood is circulated via the heart and blood vessels.

Before You Buy a Microscope
Before you buy a microscope, there are several factors that should be considered. The type of microscope you choose depends on what you would like to view.

True-Breeding Plant - Biology Glossary Definition
A true-breeding plant is one that, when self-fertilized, only produces offspring with the same traits. These individuals have homozygous alleles.

Immune System - the Body's Natural Defense Mechanism
With germs lurking around every corner, it pays to have a strong defense. Find out about the body's natural defense system, the immune system.

Bacteria Relationships - Bacteria and Humans
The decision as to whether bacteria are friend or foe becomes more difficult to determine when all aspects of the relationship between humans and bacteria are considered.

Parthenogenesis - Reproduction Without Sex
Parthenogenesis is a type of asexual reproduction that does not require the fertilization of a female egg cell. Both plants and animals reproduce in this manner.

Bacteria and Food Poisoning
Bacterial foodborne diseases strike millions of people each year. Here is a list of a few bacteria that cause food poisoning and foodborne illness.

Cloning - Types, Technique, Animals and More
What is cloning? It is the process of creating genetically identical copies of biological matter. Learn about natural clones, cloning methods, and more.

The Different Types of Cloning Techniques
Techniques used in cloning. Biology.

African Americans in Science and Their Accomplishments
Did you know that the first successful open heart surgery was performed by Dr. Daniel Hale Williams, an African American? Learn about the contributions that various African American scientists and inventors have made to science.

Desert Description - Land Biome Overview
Deserts are dry areas that experience extremely small amounts of rainfall. A desert biome may be hot or cold.

Savanna Biome: Climate, Locations, and Wildlife
Savannas are areas of open grassland with dispersed trees. Learn about the animals and vegetation of the savanna biome.

Land Biomes: Temperate Forests
Temperate forests are areas with high levels of precipitation, humidity, and contain a variety of deciduous trees.

Land Biomes: Chaparrals
Chaparrals are dry regions typically found in coastline areas. This land biome experiences frequent fires due to hot, dry conditions.

Protein Function and Structure
Proteins are very important molecules in our cells. They are constructed from amino acids and each protein within the body has a specific function.

Circulatory System
The circulatory system involves the circulation of blood which serves to move blood to a site or sites where it can be oxygenated, and where wastes can be disposed.

Four Steps of Cardiac Conduction
Have you ever wondered what causes your heart to beat? Learn about the four steps of cardiac conduction, the rate at which the heart conducts electrical impulses.

Carnivorous Plants
Carnivorous plants have special adaptations that allow them to capture, kill, and digest animal organisms. Learn more about these animal-eating plants.

Parts of a Flowering Plant
Flowering plants are the most numerous of all the divisions in the Plant Kingdom. Learn about the characteristics and parts of a flowering plant.

Parts of a Flowering Plant
Flowering plants are the most numerous of all the divisions in the Plant Kingdom. Learn about the characteristics and parts of a flowering plant. Page 2.

Allele - A Genetics Definition
An allele is an alternative form of a gene. Organisms typically have two alleles for a single trait, one being inherited from each parent.

Bacteriophage Life Cycle Animation
A bacteriophage is a virus that infects bacteria. View animations of the lytic life cycle of a bacteriophage.

Homozygous - A Genetics Definition
Homozygous - A Genetics Definition. The term homozygous refers to individuals that have identical alleles for a given trait.

Carbon Monoxide Poisoning
Information and resources pertaining to the effects of carbon monoxide and carbon monoxide poisoning.

Bacteriology
Discover the microscopic world of bacteria. Find information on bacteria, bacterial foodborne diseases, and more.

Genetics Glossary
This genetics glossary is a good resource for finding succinct, practical, and meaningful biology definitions for various genetics terms.