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Preview: About.com Biology: Most Popular Articles

About.com Biology: Most Popular Articles



These articles are the most popular over the last month.



Published: Wed, 18 Jan 2017 11:14:02 +0000

 



Cell Membranes Function, Structure and...

2017-01-18T11:14:02Z

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.



All About Animal Cells

2017-01-18T11:14:02Z

Animal cells are eukaryotic cells that contain various membrane-bound organelles.



Discover What Occurs During the Stages of Meiosis

2017-01-18T11:14:02Z

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.



6 Things You Should Know About Biological...

2017-01-18T11:14:02Z

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



What Is the Structure and Function of the...

2017-01-18T11:14:02Z

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



The 3 Main Stages of Cellular Respiration

2017-01-18T11:14:02Z

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



15 Differences Between Animal and Plant Cells

2017-01-18T11:14:02Z

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



10 Steps of Glycolysis

2017-01-18T11:14:02Z

Glycolysis is the process of breaking down glucose into two molecules of pyruvate. It produces ATP and is the first stage of cellular respiration.



3 Types of Specialized Plant Cells

2017-01-18T11:14:02Z

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 Is Incomplete Dominance in Genetics?

2017-01-18T11:14:02Z

Definition of the term incomplete dominance. Learn how incomplete dominance differs from co-dominance and how they are studied in snapdragon plants.



Learn the Basic Anatomy of the Brain

2017-01-18T11:14:02Z

This resource provides information on brain anatomy, brain divisions, cranial nerves, the central nervous system, and brain function.



What Is the Cell Theory?

2017-01-18T11:14:02Z

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.



Biology Basics: What Are Eukaryotic and...

2017-01-18T11:14:02Z

Take a journey into the cell to find out about the cell structure and classification of both prokaryotic cells and eukaryotic cells.



Stage-By-Stage Guide to Mitosis

2017-01-18T11:14:02Z

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



10 Facts We Should Know About Cells

2017-01-18T11:14:02Z

The following 10 facts about cells will provide you with well known and perhaps little known tidbits of information about cells.



7 Types of Proteins and Their Functions

2017-01-18T11:14:02Z

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



8 Different Types of Body Cells

2017-01-18T11:14:02Z

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



The Anatomy of a Heart Beat

2017-01-18T11:14:02Z

The cardiac cycle describes the cycle of events that occur when the heart beats. It consists of a diastole phase and a systole phase.



The 4 Concepts Related to Mendel's Law of...

2017-01-18T11:14:02Z

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



Cell Wall Structure and Function

2017-01-18T11:14:02Z

The cell wall is the rigid, semi-permeable protective layer found in some cells.



How Alleles Determine Traits

2017-01-18T11:14:02Z

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



Ribosomes And Protein Synthesis

2017-01-18T11:14:02Z

Ribosomes are cell organelles that consist of RNA and proteins. They are responsible for assembling the proteins of a cell.



What Allows Organisms to Transfer Their Genetic...

2017-01-18T11:14:02Z

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.



How Does DNA Transcription Work?

2017-01-18T11:14:02Z

DNA transcription is a process that involves the transcribing of genetic information from DNA to RNA. Genes are transcribed in order to produce proteins.



Why the Peripheral Nervous System Is Important

2017-01-18T11:14:02Z

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



Afraid? Blame Your Amygdala

2017-01-18T11:14:02Z

The amygdala is a brain structure responsible for autonomic responses associated with fear and fear conditioning. It processes many of our emotions.



7 Differences Between Mitosis and Meiosis

2017-01-18T11:14:02Z

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.



Steps of DNA Replication

2017-01-18T11:14:02Z

DNA replication is the process of copying the DNA within our cells. This process involves RNA and several enzymes, including DNA polymerase and primase.



How Chromosome Mutations Occur

2017-01-18T11:14:02Z

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 Limbic System and Our Emotions

2017-01-18T11:14:02Z

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 Are the 6 Kingdoms of Life?

2017-01-18T11:14:02Z

Living organisms are classified into one of six Kingdoms of life. They are placed into these categories based on common characteristics.



Blood and Other Types of Connective Tissue

2017-01-18T11:14:02Z

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



What Is So Unique About Red Blood Cells?

2017-01-18T11:14:02Z

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



Four Cerebral Cortex Lobes

2017-01-18T11:14:02Z

The cerebral cortex lobes include the parietal, frontal, occipital and temporal lobes. They are responsible for processing input from various sources.



The Magic of Photosynthesis: How Plants Turn...

2017-01-18T11:14:02Z

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



White, Brown, and Beige Fat

2017-01-18T11:14:02Z

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.



5 Types of Specialized Plant Cells

2017-01-18T11:14:02Z

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



What You Need to Know About Organ Systems

2017-01-18T11:14:02Z

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



What Are Homologous Chromosomes?

2017-01-18T11:14:02Z

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



Prokaryotes: Bacteria and Archaeans

2017-01-18T11:14:02Z

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



Biology Basics: Characteristics of Life

2017-01-18T11:14:02Z

What is biology? Simply put, it is the study of life. Discover the basic principles of biology and the characteristics of life.



What's the Role of the Central Nervous System?

2017-01-18T11:14:02Z

The central nervous system is responsible for processing information received from all parts of the body. The main organs are the brain and spinal cord.



4 Types of Protein Structure

2017-01-18T11:14:02Z

Protein structure is determined by amino acids sequences. The four protein structure types are primary, secondary, tertiary, and quaternary structure.



Don't Look Like Your Sibs? Mendel's Law of...

2017-01-18T11:14:02Z

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



Learn What Independent Assortment Is Through...

2017-01-18T11:14:02Z

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.



Male or Female? How Chromosomes Play a Role in...

2017-01-18T11:14:02Z

What is the relationship between chromosomes and sex? Sex is determined by the presence or absence of certain chromosomes.



Brain Anatomy: Cerebral Cortex

2017-01-18T11:14:02Z

The cerebral cortex is the outer covering of the cerebrum. It is the layer of the brain often referred to as gray matter.



Get to Know the Main Parts of the Brain

2017-01-18T11:14:02Z

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.



Glossary of Cell Biology Terms

2017-01-18T11:14:02Z

Do you know what the cytoskeleton does? This cell biology glossary is a good resource for finding succinct, practical, and meaningful biology definitions for various cell biology terms.



Monohybrid Cross: A Breeding Experiment

2017-01-18T11:14:02Z

Definition of the term monohybrid cross.



Is Spontaneous Generation Real?

2017-01-18T11:14:02Z

Spontaneous generation is the idea that living organisms can arise from nonliving substances. This idea was disproved through scientific experimentation.



What is a Capillary Fluid Exchange?

2017-01-18T11:14:02Z

A capillary is an extremely small blood vessel located within the body tissues. Gasses, nutrients, and fluids are exchanged through capillaries.



How Chloroplasts Make Photosynthesis Possible

2017-01-18T11:14:02Z

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



What Is the Corpus Callosum?

2017-01-18T11:14:02Z

The corpus callosum is a thick band of nerve fibers that divides the cerebrum into left and right hemispheres.



Using the 3 Domain System to Classify Organisms

2017-01-18T11:14:02Z

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



What's In Your Blood?

2017-01-18T11:14:02Z

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.



What's the Function of the Thymus?

2017-01-18T11:14:02Z

The thymus is a small glandular structure that regulates the immune system through the production of specific immune cells called lymphocytes.



What You Should Know About Mitrochondria

2017-01-18T11:14:02Z

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



Cell Model and Structure of the Endoplasmic...

2017-01-18T11:14:02Z

The endoplasmic reticulum is a network of tubules and flattened sacs that produce and process lipids and proteins in plant and animal cells.



Integumentary System and Skin Layers

2017-01-18T11:14:02Z

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



What Is Chromatin?

2017-01-18T11:14:02Z

Chromatin is a mass of genetic material composed of DNA and proteins that condenses to form chromosomes. Chromatin compresses DNA into a compact unit.



Broca's Area and Speech

2017-01-18T11:14:02Z

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



Know the Steps of the Scientific Method

2017-01-18T11:14:02Z

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world.



7 Weird Facts About Snakes

2017-01-18T11:14:02Z

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



Translation: Making Protein Synthesis Possible

2017-01-18T11:14:02Z

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



How the Pineal Gland Controls Your Biological...

2017-01-18T11:14:02Z

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



Mitosis Glossary

2017-01-18T11:14:02Z

This mitosis glossary is a good resource for finding succinct, practical, and meaningful biology definitions for common mitosis terms.



What Is the Diencephalon?

2017-01-18T11:14:02Z

The diencephalon, along with the telencephalon comprise the two major divisions of forebrain. The thalamus is a major component of the diencephalon.



The Anatomy of Your Heart

2017-01-18T11:14:02Z

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.



The 3 Types of Muscle Tissue

2017-01-18T11:14:02Z

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.



Why Organelles Are Important to Cells

2017-01-18T11:14:02Z

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.



Bone Marrow Structure and Function

2017-01-18T11:14:02Z

Bone marrow is the soft tissue found inside bones that functions mainly to produce red blood cells, white blood cells, and platelets.



3 Major Lipid Groups

2017-01-18T11:14:02Z

Lipids are diverse compounds that are insoluble in water. They store energy, protect against water loss, and form cell membranes.



Biology Basics: What Are Sex Cells?

2017-01-18T11:14:02Z

Sex cells are reproductive cells or gametes. Female ova are large and round, while male sperm are long and motile. Sex cells are formed by meiosis.



Differences Between Normal Cells and Cancer Cells

2017-01-18T11:14:02Z

Normal cells differ from cancer cells in a number of important areas. Mainly, cancer cells acquire the ability to proliferate uncontrollably.



Learn What Happens During the 4 Stages of Mitosis

2017-01-18T11:14:02Z

This study guide introduces you to the basics of mitosis and the mitotic process.



Diploid Cell: Double the Chromosome Number

2017-01-18T11:14:02Z

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.



The Nucleus: Keeping a Cell's Heredity and...

2017-01-18T11:14:02Z

The nucleus is a cell structure that contains hereditary information, or DNA, and controls cellular growth and reproduction.



25 Biology and Anatomy Activities to Liven Up...

2017-01-18T11:14:02Z

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.



What Makes a Trait Homozygous?

2017-01-18T11:14:02Z

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



Top 5 Reasons to Wash Your Hands

2017-01-18T11:14:02Z

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.



How to Format a Biology Lab Report

2017-01-18T11:14:02Z

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.



How Sexual Reproduction Occurs in Animals

2017-01-18T11:14:02Z

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



6 Steps of Virus Replication

2017-01-18T11:14:02Z

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



22 Ideas for Science Experiments Using Plants

2017-01-18T11:14:02Z

The following project ideas using plants provide suggestions for topics that can be explored through experimentation.



How Gene Mutation Occurs:

2017-01-18T11:14:02Z

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.



Circulatory System: Pulmonary and Systemic...

2017-01-18T11:14:02Z

The circulatory system circulates blood by pulmonary and systemic circuits. These pathways transport blood between the heart and the rest of the body.



Why the Brainstem is Your Body's Motion...

2017-01-18T11:14:02Z

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.



What Are the Major Land Biomes?

2017-01-18T11:14:02Z

Biomes are identified by the vegetation and animals that populate them. The location of each biome is determined by the regional climate.



Cell Membrane - Components and Function

2017-01-18T11:14:02Z

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.



What's the Role of a Cell's Cytoplasm?

2017-01-18T11:14:02Z

The cytoplasm is a clear substance that consists of all of the contents outside of the nucleus of a membrane bound cell.



What Does Heterozygous Mean?

2017-01-18T11:14:02Z

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



Gametes: The Building Blocks of Sexual...

2017-01-18T11:14:02Z

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



Know the Characteristics of Temperate...

2017-01-18T11:14:02Z

Temperate grasslands are savanna-like areas located in cold climate regions. Learn about the animals and plants in this biome.



4 Sex Chromosome Abnormalities Caused by Mutation

2017-01-18T11:14:02Z

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



What Are the Types of Asexual Reproduction?

2017-01-18T11:14:02Z

Asexual reproduction involves producing progeny that are genetic clones of the parent. This can be done by regeneration, budding, and binary fission.



What is the Cerebellum?

2017-01-18T11:14:02Z

The cerebellum is the area of the hindbrain that controls motor movement coordination, balance, equilibrium and muscle tone.



Layers of the Heart Wall

2017-01-18T11:14:02Z

The layers of the heart wall consist of the outer epicardium, the middle myocardium, and the inner endocardium. Cardiac muscle powers heart contractions.



What Causes Swollen Lymph Nodes?

2017-01-18T11:14:02Z

Lymph nodes are specialized structures in the body that filter lymph fluid of harmful pathogens, cancer cells, and cellular waste.



What's it Like in a Savanna Land Biome?

2017-01-18T11:14:02Z

Savannas are areas of open grassland with dispersed trees. Learn about the animals and vegetation of the savanna biome.