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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: Sun, 04 Dec 2016 11:17:13 +0000

 



Cell Membranes Function, Structure and...

2016-12-04T11:17:13Z

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

2016-12-04T11:17:13Z

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



What Is the Structure and Function of the...

2016-12-04T11:17:13Z

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



Discover What Occurs During the Stages of Meiosis

2016-12-04T11:17:13Z

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.



15 Differences Between Animal and Plant Cells

2016-12-04T11:17:13Z

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



6 Things You Should Know About Biological...

2016-12-04T11:17:13Z

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



The 3 Main Stages of Cellular Respiration

2016-12-04T11:17:13Z

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



8 Different Types of Body Cells

2016-12-04T11:17:13Z

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



3 Types of Specialized Plant Cells

2016-12-04T11:17:13Z

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.



10 Steps of Glycolysis

2016-12-04T11:17:13Z

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



Biology Basics: What Are Eukaryotic and...

2016-12-04T11:17:13Z

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



Learn the Basic Anatomy of the Brain

2016-12-04T11:17:13Z

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



10 Facts We Should Know About Cells

2016-12-04T11:17:13Z

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



What Is the Cell Theory?

2016-12-04T11:17:13Z

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.



Stage-By-Stage Guide to Mitosis

2016-12-04T11:17:13Z

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



Cell Wall Structure and Function

2016-12-04T11:17:13Z

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



The Anatomy of a Heart Beat

2016-12-04T11:17:13Z

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



What Is Incomplete Dominance in Genetics?

2016-12-04T11:17:13Z

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



Ribosomes And Protein Synthesis

2016-12-04T11:17:13Z

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



How Alleles Determine Traits

2016-12-04T11:17:13Z

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



Why the Peripheral Nervous System Is Important

2016-12-04T11:17:13Z

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



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

2016-12-04T11:17:13Z

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



Afraid? Blame Your Amygdala

2016-12-04T11:17:13Z

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



7 Types of Proteins and Their Functions

2016-12-04T11:17:13Z

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



The Limbic System and Our Emotions

2016-12-04T11:17:13Z

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.



7 Differences Between Mitosis and Meiosis

2016-12-04T11:17:13Z

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.



What Allows Organisms to Transfer Their Genetic...

2016-12-04T11:17:13Z

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.



White, Brown, and Beige Fat

2016-12-04T11:17:13Z

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

2016-12-04T11:17:13Z

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

2016-12-04T11:17:13Z

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 Is So Unique About Red Blood Cells?

2016-12-04T11:17:13Z

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



What's the Role of the Central Nervous System?

2016-12-04T11:17:13Z

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.



Steps of DNA Replication

2016-12-04T11:17:13Z

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



Interesting Facts You May Not Know About Turkeys

2016-12-04T11:17:13Z

Before sitting down to enjoy that turkey meal, I believe it's fitting to pay tribute to this splendid bird by discovering some interesting turkey facts.



How Does DNA Transcription Work?

2016-12-04T11:17:13Z

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



The Magic of Photosynthesis: How Plants Turn...

2016-12-04T11:17:13Z

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



Blood and Other Types of Connective Tissue

2016-12-04T11:17:13Z

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



Four Cerebral Cortex Lobes

2016-12-04T11:17:13Z

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



How Chromosome Mutations Occur

2016-12-04T11:17:13Z

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.



Differences Between Normal Cells and Cancer Cells

2016-12-04T11:17:13Z

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



Prokaryotes: Bacteria and Archaeans

2016-12-04T11:17:13Z

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



What is a Capillary Fluid Exchange?

2016-12-04T11:17:13Z

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



Glossary of Cell Biology Terms

2016-12-04T11:17:13Z

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.



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

2016-12-04T11:17:13Z

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



What Are Homologous Chromosomes?

2016-12-04T11:17:13Z

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



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

2016-12-04T11:17:13Z

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



Monohybrid Cross: A Breeding Experiment

2016-12-04T11:17:13Z

Definition of the term monohybrid cross.



How the Pineal Gland Controls Your Biological...

2016-12-04T11:17:13Z

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



Get to Know the Main Parts of the Brain

2016-12-04T11:17:13Z

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.



Biology Basics: Characteristics of Life

2016-12-04T11:17:13Z

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 Diencephalon?

2016-12-04T11:17:13Z

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



How Do Animals Avoid Becoming Prey?

2016-12-04T11:17:13Z

Defense mechanisms are very important to all animal life. They can give prey an advantage against hungry predators.



Brain Anatomy: Cerebral Cortex

2016-12-04T11:17:13Z

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



Cell Model and Structure of the Endoplasmic...

2016-12-04T11:17:13Z

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



What's In Your Blood?

2016-12-04T11:17:13Z

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 Is the Corpus Callosum?

2016-12-04T11:17:13Z

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



How Science Has Built a Better Thanksgiving...

2016-12-04T11:17:13Z

For several decades researchers have been using science to build a better Thanksgiving turkey. These techniques involve selective breeding and nutrition management.



How Sexual Reproduction Occurs in Animals

2016-12-04T11:17:13Z

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



What's the Function of the Thymus?

2016-12-04T11:17:13Z

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



How Chloroplasts Make Photosynthesis Possible

2016-12-04T11:17:13Z

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



What You Should Know About Mitrochondria

2016-12-04T11:17:13Z

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



4 Types of Protein Structure

2016-12-04T11:17:13Z

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



What's it Like in a Savanna Land Biome?

2016-12-04T11:17:13Z

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



What Are the 6 Kingdoms of Life?

2016-12-04T11:17:13Z

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



What Is Chromatin?

2016-12-04T11:17:13Z

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



Learn What Independent Assortment Is Through...

2016-12-04T11:17:13Z

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.



How to Format a Biology Lab Report

2016-12-04T11:17:13Z

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.



Mitosis Glossary

2016-12-04T11:17:13Z

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



What Are the Major Land Biomes?

2016-12-04T11:17:13Z

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



Why Organelles Are Important to Cells

2016-12-04T11:17:13Z

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.



Know the Characteristics of Temperate...

2016-12-04T11:17:13Z

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



Integumentary System and Skin Layers

2016-12-04T11:17:13Z

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

2016-12-04T11:17:13Z

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



Broca's Area and Speech

2016-12-04T11:17:13Z

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



Bone Marrow Structure and Function

2016-12-04T11:17:13Z

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



22 Ideas for Science Experiments Using Plants

2016-12-04T11:17:13Z

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



6 Steps of Virus Replication

2016-12-04T11:17:13Z

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



3 Major Lipid Groups

2016-12-04T11:17:13Z

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



The 3 Types of Muscle Tissue

2016-12-04T11:17:13Z

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.



Types of Fertilization in Sexual Reproduction

2016-12-04T11:17:13Z

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



How Gene Mutation Occurs:

2016-12-04T11:17:13Z

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.



What is the Cerebellum?

2016-12-04T11:17:13Z

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



The Anatomy of Your Heart

2016-12-04T11:17:13Z

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.



30+ Ideas for Animal Experiments and Projects

2016-12-04T11:17:13Z

Animal projects and studies are important for students to understand various biological processes in animals and even humans. Try some of these ideas.



Biology Basics: What Are Sex Cells?

2016-12-04T11:17:13Z

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.



Know the Steps of the Scientific Method

2016-12-04T11:17:13Z

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



Ten Amazing Bioluminescent Organisms

2016-12-04T11:17:13Z

Some organisms such as jellyfish have the ability to glow. The light emitted is due to a chemical reaction. Discover 10 amazing bioluminescent organisms.



Diploid Cell: Double the Chromosome Number

2016-12-04T11:17:13Z

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.



Cell Membrane - Components and Function

2016-12-04T11:17:13Z

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.



8 Types of Biology-Based Science Fair Projects...

2016-12-04T11:17:13Z

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



25 Biology and Anatomy Activities to Liven Up...

2016-12-04T11:17:13Z

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's it Like in a Temperate Forest Land Biome?

2016-12-04T11:17:13Z

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



What Does Heterozygous Mean?

2016-12-04T11:17:13Z

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



Translation: Making Protein Synthesis Possible

2016-12-04T11:17:13Z

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



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

2016-12-04T11:17:13Z

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



Circulatory System: Pulmonary and Systemic...

2016-12-04T11:17:13Z

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



Learn What Happens During the 4 Stages of Mitosis

2016-12-04T11:17:13Z

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



What Makes a Trait Homozygous?

2016-12-04T11:17:13Z

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



What Everyone Should Know About White Blood Cells

2016-12-04T11:17:13Z

Also called leukocytes, white blood cells play an important role in the immune system by protecting the body from infectious agents.



What Is a Vein?

2016-12-04T11:17:13Z

A vein is an elastic blood vessel that transports blood from various regions of the body to the heart. Veins can be categorized into different types.