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Biology: Most Popular Articles

These articles are the most popular over the last month.
Don't Look Like Your Sibs? Mendel's Law of...
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes.
The 4 Concepts Related to Mendel's Law of...
Mendel's Law of Segregation states that allele pairs separate during gamete formation, and randomly unite at fertilization.
The 10 Steps of Glycolysis
In glycolysis, glucose is split into two molecules of a three-carbon sugar.
Learn What Independent Assortment Is Through...
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.
What's the Role of the Central Nervous System?
The nervous system is comprised of the central nervous system and the peripheral nervous system. The central nervous system is responsible for processing information received from the peripheral nervous system.
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 Incomplete Dominance in Genetics?
Definition of the term incomplete dominance.
What Are the 6 Kingdoms of Life?
Living organisms are classified into three Domains and into one of six Kingdoms of life.
The 7 Types of Proteins and Their Functions
Proteins are very important molecules in our cells. Each protein within the body has a specific function.
What Is an Allele?
An allele is an alternative form of a gene.
What Is the Peripheral Nervous System and Why...
The nervous system can be divided into two parts, the central nervous system and the peripheral nervous system.
What Does the Pineal Gland Actually Do?
The pineal gland is a pine cone shaped gland of the endocrine system that produces several important hormones including melatonin.
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.
How Does DNA Transcription Work?
DNA transcription is a process that involves the transcribing of genetic information from DNA to RNA.
What Does Our Hypothalamus Do for Us?
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 and also regulates endocrine system hormones.
What You Need to Know About Organ Systems
The human body is made up of several organ systems that work together as one unit.
The 3 Main Stages of Cellular Respiration
Cellular respiration is a process by which cells harvest the energy stored in food. Glycolysis, the citric acid cycle, and electron transport are the three main processes of cellular respiration.
Learn the Basic Anatomy of the Brain
Due to its intricate structure and function, the anatomy of the brain is complex. This resource provides information on brain anatomy, the central nervous system, and brain function.
What is the Cerebellum?
The cerebellum is the area of the hindbrain that controls motor movement coordination, balance, equilibrium and muscle tone.
Male or Female? How Chromosomes Play a Role in...
What is the relationship between chromosomes and sex? Sex is determined by the presence or absence of certain chromosomes.
What Is the Medulla Oblongata?
The medulla oblongata is a portion of the hindbrain that controls autonomic functions such as breathing, digestion and heart rate.
The Magic of Photosynthesis: How Plants Turn...
Photosynthesis is a process in which light energy is used to produce sugar and other organic compounds.
Protein Synthesis - Translation
Protein synthesis is accomplished through a process called translation. In translation, RNA and ribosomes work together to produce proteins.
What Is the Corpus Callosum?
The corpus callosum is a thick band of nerve fibers that divides the cerebrum into left and right hemispheres.
What You Should Know About Mitrochondria
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell.
Everything You Ever Wanted to Know about Cell...
The cell membrane is a thin semi-permeable membrane that surrounds the cell's cytoplasm, enclosing its contents.
Why Your Brain's Frontal Lobes Are Important
The frontal lobes are one of the four main lobes or regions of the cerebral cortex.
Parts of a Flowering Plant Quiz
Parts of a Flowering Plant Quiz Take Our Quiz About Flowering Plants Sorry, but this quiz requires that
All About Animal Cells
Animal cells are eukaryotic cells that contain various membrane-bound organelles.
Mendel's Law of Segregation
The principles that govern heredity were discovered by a monk named Gregor Mendel in the 1860's. One of these principles is now called Mendel's law of segregation.
Hippocampus
The hippocampus is the part of the brain that is involved in memory forming, organizing, and storing. It is a limbic system structure that is particularly important in forming new memories and connecting emotions and senses, such as smell and sound, to memories.
Phases of the Cardiac Cycle
The cardiac cycle is the cycle of events that occurs as the heart contracts.
Prokaryotes
Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. Prokaryotes include bacteria and archaeans.
What Does the Limbic System Control in the Brain?
The limbic system is responsible for controlling various functions in the body. Structures of this system include the hippocampus, hypothalamus, and thalamus.
Stages of Mitosis
A stage-by-stage guide to the phases of mitosis.
Amygdala
The amygdala is an almond shaped mass of nuclei located deep within the temporal lobe of the brain.
Thalamus
The thalamus is a large, dual lobed mass of grey matter buried under the cerebral cortex. It is involved in sensory perception and regulation of motor functions.
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 of the structures of the brain.
Reproduction in Animals: Sexual Reproduction
An introduction to the mechanisms of sexual reproduction in animals.
Cerebral Cortex
The cerebral cortex is the layer of the brain often referred to as gray matter. It is the outer portion of the cerebrum.
10 Interesting Facts About Cells
The following 10 facts about cells will provide you with well known and perhaps little known tidbits of information about cells.
Cardiac Cycle
The cardiac cycle is the sequence of events that occurs when the heart beats.
Sex-Linked Traits
Sex linked traits originate from genes found on sex chromosomes. Hemophilia is an example of a common sex linked disorder that is an X linked recessive trait.
Anatomy of the Brain - Pons
The pons serves as a communications and coordination center between the two hemispheres of the brain.
What Is Asexual Reproduction?
An introduction to the mechanisms of asexual reproduction in animals. Common forms of this type of reproduction include budding, gemmules, fragmentation, regeneration, and parthenogenesis.
What Does the Pituitary Gland Really Do?
The pituitary gland is a small endocrine system organ that controls a multitude of important functions in the body.
Brainstem
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.
Gene Mutation
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.
Cell Model and Structure of the Endoplasmic...
The endoplasmic reticulum is a network of tubules and flattened sacs that serve a variety of functions in the cell.
Anatomy of the Brain - Parietal Lobes
Information and resources pertaining to the parietal lobes
Temporal Lobes
The temporal lobes are one of the four main lobes or regions of the cerebral cortex. The temporal lobes play an important role in organizing sensory input, auditory perception and memory.
Bacterial Reproduction
Bacterial reproduction most commonly occurs by a kind of cell division called binary fission. Other forms of bacterial reproduction include conjugation, transformation, and transduction.
Mendel's Law of Independent Assortment - A...
Definition of Mendel's law of independent assortment.
Plant Cell
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.
Blood Type
The presence or absence of certain identifiers on the surface of red blood cells determine human blood type.
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.
The Cell
Take a journey into the cell to find out about the cell structure of both prokaryotic cells and eukaryotic cells.
Anatomy of the Brain - 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.
Protein Structure
Protein structure is determined by the sequence of amino acids that form a protein. The four protein structure levels are primary, secondary, tertiary, and quaternary structure.
Why Ribosomes Are Essential
Ribosomes are cell organelles that consist of RNA and proteins. They are responsible for assembling the proteins of the cell.
Occipital Lobes
The occipital lobes are positioned at the back region of the cerebral cortex and are the main centers for visual processing.
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.
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.
Heart Anatomy
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 this amazing organ.
Broca's Area
Broca's area is one of the main areas of the cerebral cortex responsible for producing language.
What Does Heterozygous Mean?
Definition of the word heterozygous.
Diploid Cell
A diploid cell is a cell that contains two sets of chromosomes.
White Blood Cell
Also called leukocytes, white blood cells play an important role in the immune system by protecting the body from infectious agents.
Homeostasis
Homeostasis is the ability to maintain a constant internal environment in response to environmental changes.
Parts of a Flowering Plant
Learn about the characteristics and parts of a flowering plant.
What Is the Cell Theory?
The Cell Theory is one of the basic principles of biology. It states that all living things are composed of cells.
Biology Lab Reports
If you are taking a biology course, you are going to write biology lab reports. Find information about using a good lab report format to properly write a lab report.
Ventricles of the Heart
The ventricles of the heart function to pump blood to the entire body.
Haploid Cell
A haploid cell is a cell that contains one complete set of chromosomes.
The Heart
The heart is the organ that supplies blood and oxygen to all parts of the body.
Hand Sanitizers vs. Soap and Water
Should you wash your hands with a hand sanitizer or soap and water?
Biology
What is biology? Simply put, it is the study of life.
Connective Tissue
Explore the structure and function of animal tissues, including connective tissue.
Virus Replication
Learn about virus replication and how viruses infect cells.
What is a Capillary Fluid Exchange?
A capillary is an extremely small blood vessel located within the tissues of the body.
Coronary Arteries
Information and resources pertaining to the coronary arteries of the heart.
Cellular Respiration Quiz
cellular respiration, quiz
Secretion of Bile and the Role of Bile Acids In...
Information on bile secretion and digestion.: bile acids fat soluble vitamins bile ducts small intestine organic molecules
Cardiovascular System
The cardiovascular system is responsible for transporting nutrients and removing gaseous waste from the body. This system is comprised of the heart and the circulatory system.
9 Steps to Get You Ready for AP Bio Exams
Here are some excellent tips to help you learn how to study for biology exams.
Heart Anatomy Quiz
anatomy quiz, heart anatomy
Skeletal System
The skeletal system is the support system for the body. It gives the body shape, form, and mobility while providing protection for sensitive organs.
Anatomy of the Heart: Pericardium
Information and resources pertaining to the pericardium of the human heart.
Lymphatic System
Lymphatic system structures collect, filter, and return lymph to blood circulation.
Gametes
Gametes are reproductive cells. These cells unite to form a new cell called a zygote.
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.
Sexual Reproduction: Fertilization
In sexual reproduction, fertilization involves the donation of genes from two parents which results in the production of offspring with a mix of inherited genes.
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.
Sex Chromosome Abnormalities
Sex chromosome abnormalities occur as a result of chromosome mutations brought on by mutagens or problems that occur during meiosis.
Biological Evolution
Biological evolution is defined as any genetic change in a population that is inherited over several generations.
Integumentary System
The integumentary system consists of the largest organ in the body, the skin. This extraordinary organ system protects the internal structures of the body from damage, prevents dehydration, stores fat and produces vitamins and hormones.
What Is the Diencephalon?
The diencephalon, along with the telencephalon comprise the two major divisions of forebrain.
Blood Vessels
Blood vessels are intricate networks of hollow tubes that transport blood throughout the entire body.
Anatomy of the Heart: Valves
Information and resources pertaining to the human heart valves.
Diffusion and Passive Transport
Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Page 2.
Biology Study Tips
Need help studying for biology? I've got some great biology study tips for you.
Lymphocytes
Lymphocytes are a type of white blood cell that provide a means for specific and nonspecific immunity against antigens.
Homozygous - A Genetics Definition
Definition of the word homozygous.
Nucleic Acids
Nucleic acids allow organisms to transfer genetic information from one generation to the next.
How to Make a Lung Model
Try this simple demonstration that shows how to make a working lung model.
Land Biomes: Temperate Forests
Temperate forests are areas with high levels of precipitation, humidity, and contain a variety of deciduous trees.
Thymus
The thymus is a small glandular structure that regulates the immune system through the production of specific immune cells called lymphocytes.
Photosynthesis Quiz
photosynthesis, quiz
Do You Know How Your Digestive System Absorbs...
Information and resources pertaining to the human digestive system and nurtrient absorption.
Do Brain Cells Regenerate?
For almost one hundred years scientists believed that brain cells don't regenerate, until now.
What Is a Pulmonary Artery?
Information and resources pertaining to the pulmonary artery of the heart.
Turkey Facts
Before sitting down to enjoy that holiday turkey meal, I believe it is appropriate to pay tribute to this splendid bird by discovering some interesting turkey facts.
Anatomy of the Heart: Aorta
Information and resources pertaining to the aorta of the heart.
Alcohol Hangover
Drinking too much alcohol can lead to alcohol hangover. Learn about alcohol hangover symptoms and how to prevent hangover.
Plant Tissue Systems
Plant tissue systems are composed of dermal tissue, vascular tissue, and ground tissue systems. These systems provide support, nutrient formation and transportation, growth, and protection for a plant.
Atria of the Heart
The atria of the heart receive blood returning to the heart from other areas of the body.
Blood
Blood is the life fluid of the body as it provides nourishment to the cells, tissues, and organs of the body.
Anatomy of the Brain - Basal ganglia
Information and resources pertaining to the basal ganglia
Metabolic Functions of the Liver
Information on the metabolic functions of the liver including information on carbohydrate, fat and protein metabolism.
Sinoatrial Node
Information and resources pertaining to the sinoatrial node of the heart.
Types of Plant Cells
There have a number of important specialized types of plant cells. Some examples of specialized plant cells include parenchyma cells, collenchyma cells and sclerenchyma cells.
Anatomy of the Stomach - Gastric Secretions
Information on gastric secretions including hormones, mucus and acid.
What Are Carotid Arteries?
The carotid arteries are blood vessels that supply blood to the head, neck and brain.
What Is a Dihybrid Cross?
Definition of the term dihybrid cross.
Normal Cells Versus Cancer Cells
How do normal cells differ from cancer cells? Learn about the properties of normal cells versus cancer cells.
The Importance of Genetic Variation
In genetic variation, the alleles of organisms within a population change.
Biology Basics: What Are Sex Cells
Sex cells are male and female reproductive cells. They are produced through the cell division process of meiosis.
Muscle Tissue
Explore the structure and function of cardiac, smooth, and skeletal muscle tissue.
Four Steps of Cardiac Conduction
Learn about the four steps of cardiac conduction, the rate at which the heart conducts electrical impulses.
Lipids
Lipids are very diverse in both their respective structures and functions. Examples of lipids include fats, phospholipids, steroids and waxes.
How Do Steroid Hormones Work?
Become familiar with how steroid hormones work in the body to produce proteins.
What Is a Chromosome?
A chromosome is a long, stringy aggregate of genes that carries heredity information and is formed from condensed chromatin.
Neurons
All cells of the nervous system are comprised of neurons. Neurons are responsible for sending, receiving, and interpreting information from all parts of the body.
Lymphatic Vessels
Lymphatic vessels filter and transport fluid away from tissues before returning it to the blood. This helps to maintain normal blood volume and pressure.
Nucleus
The nucleus is a cell structure that contains hereditary information, or DNA, and controls cellular growth and reproduction.
Taxonomy
Taxonomy is a hierarchical system for classifying and identifying organisms.
Nervous Tissue
Explore the structure and function of nervous tissue and neurons, also called nerve cells.
Anatomy of the Brain - Reticular Formation
Information and resources pertaining to the reticular formation
Atrioventricular Node
Information and resources pertaining to the atrioventricular node of the heart.
What Is a Vein?
A vein is an elastic blood vessel that transports blood from various regions of the body to the heart. Veins can be categorized into pulmonary, systemic, superficial, and deep veins.
Mitosis Study Guide
This study guide introduces you to the basics of mitosis and the mitotic process.
Digestive System - The Esophagus
Information on the esophogus and its role in digestion.
Salivary Glands and Saliva
Find information on salivary glands, saliva, mucus and their function in digestion.
Monohybrid Cross - A Genetics Definition
Definition of the term monohybrid cross.
Artery
An artery is an elastic blood vessel that transports blood away from the heart. Pulmonary and systemic arteries are two main types of arteries.
Biology Questions
Get answers to frequently asked biology related questions.
How Do Phospholipids Help Hold a Cell Together?
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.
Tricuspid Valve
Information and resources pertaining to the tricuspid valve of the heart.

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