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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, 28 Sep 2016 11:13:39 +0000

 



All About Animal Cells

2016-09-28T11:13:39Z

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



Cell Membranes Function, Structure and...

2016-09-28T11:13:39Z

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.



What Is the Structure and Function of the...

2016-09-28T11:13:39Z

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



15 Differences Between Animal and Plant Cells

2016-09-28T11:13:39Z

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



3 Types of Specialized Plant Cells

2016-09-28T11:13:39Z

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.



Biology Basics: What Are Eukaryotic and...

2016-09-28T11:13:39Z

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



8 Different Types of Body Cells

2016-09-28T11:13:39Z

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



What Is the Cell Theory?

2016-09-28T11:13:39Z

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.



7 Types of Proteins and Their Functions

2016-09-28T11:13:39Z

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



Ribosomes And Protein Synthesis

2016-09-28T11:13:39Z

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...

2016-09-28T11:13:39Z

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.



10 Facts We Should Know About Cells

2016-09-28T11:13:39Z

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



Learn the Basic Anatomy of the Brain

2016-09-28T11:13:39Z

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



Is the 5-Second Rule True or a Myth?

2016-09-28T11:13:39Z

Most people have applied the 5-second rule when eating foods they have dropped on the floor. Is there any truth to this rule or is it a myth?



White, Brown, and Beige Fat

2016-09-28T11:13:39Z

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.



6 Things You Should Know About Biological...

2016-09-28T11:13:39Z

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 10 Steps of Glycolysis

2016-09-28T11:13:39Z

In glycolysis, glucose is split into two molecules of a three-carbon sugar.



The Anatomy of a Heart Beat

2016-09-28T11:13:39Z

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 3 Main Stages of Cellular Respiration

2016-09-28T11:13:39Z

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



Blood and Other Types of Connective Tissue

2016-09-28T11:13:39Z

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



5 Types of Specialized Plant Cells

2016-09-28T11:13:39Z

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



Afraid? Blame Your Amygdala

2016-09-28T11:13:39Z

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



What You Need to Know About Organ Systems

2016-09-28T11:13:39Z

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



Why the Peripheral Nervous System Is Important

2016-09-28T11:13:39Z

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



Prokaryotes: Bacteria and Archaeans

2016-09-28T11:13:39Z

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



Discover What Occurs During the Stages of Meiosis

2016-09-28T11:13:39Z

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.



The Limbic System and Our Emotions

2016-09-28T11:13:39Z

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 So Unique About Red Blood Cells?

2016-09-28T11:13:39Z

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



Cell Wall Structure and Function

2016-09-28T11:13:39Z

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



3 Major Lipid Groups

2016-09-28T11:13:39Z

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



Four Cerebral Cortex Lobes

2016-09-28T11:13:39Z

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



10 Amazing Animal Facts

2016-09-28T11:13:39Z

Did you know that although polar bears look white, they actually have black skin? Discover several wondrous and fascinating facts about animals.



What's the Role of the Central Nervous System?

2016-09-28T11:13:39Z

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



What to Know About Protein Structures

2016-09-28T11:13:39Z

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.



What Is Asexual Reproduction?

2016-09-28T11:13:39Z

In asexual reproduction, one individual produces offspring that are genetically identical to itself. Common forms of asexual reproduction include budding, regeneration, and parthenogenesis.



How Alleles Determine Traits

2016-09-28T11:13:39Z

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



Cell Model and Structure of the Endoplasmic...

2016-09-28T11:13:39Z

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



Know the Steps of the Scientific Method

2016-09-28T11:13:39Z

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



What Are the 6 Kingdoms of Life?

2016-09-28T11:13:39Z

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



How to Format a Biology Lab Report

2016-09-28T11:13:39Z

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.



Stage-By-Stage Guide to Mitosis

2016-09-28T11:13:39Z

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



Glossary of Cell Biology Terms

2016-09-28T11:13:39Z

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.



What You Should Know About Mitrochondria

2016-09-28T11:13:39Z

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



Biology Basics: Characteristics of Life

2016-09-28T11:13:39Z

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



How Chloroplasts Make Photosynthesis Possible

2016-09-28T11:13:39Z

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



Why Organelles Are Important to Cells

2016-09-28T11:13:39Z

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.



Brain Anatomy: Cerebral Cortex

2016-09-28T11:13:39Z

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

2016-09-28T11:13:39Z

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.



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

2016-09-28T11:13:39Z

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



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

2016-09-28T11:13:39Z

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



Using the 3 Domain System to Classify Organisms

2016-09-28T11:13:39Z

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



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

2016-09-28T11:13:39Z

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



Broca's Area and Speech

2016-09-28T11:13:39Z

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



22 Ideas for Science Experiments Using Plants

2016-09-28T11:13:39Z

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



The 3 Types of Muscle Tissue

2016-09-28T11:13:39Z

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.



What Is Incomplete Dominance in Genetics?

2016-09-28T11:13:39Z

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



30+ Ideas for Animal Experiments and Projects

2016-09-28T11:13:39Z

Animal projects and studies are important for students to understanding various biological processes in animals and even humans. Here are some ideas.



How the Pineal Gland Controls Your Biological...

2016-09-28T11:13:39Z

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



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

2016-09-28T11:13:39Z

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



How Do Animals Avoid Becoming Prey?

2016-09-28T11:13:39Z

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



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

2016-09-28T11:13:39Z

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



What Is the Corpus Callosum?

2016-09-28T11:13:39Z

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



How Do Phospholipids Help Hold a Cell Together?

2016-09-28T11:13:39Z

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.



How Sexual Reproduction Occurs in Animals

2016-09-28T11:13:39Z

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



The Magic of Photosynthesis: How Plants Turn...

2016-09-28T11:13:39Z

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



How Does DNA Transcription Work?

2016-09-28T11:13:39Z

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



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

2016-09-28T11:13:39Z

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



What's In Your Blood?

2016-09-28T11:13:39Z

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.



Cell Membrane - Components and Function

2016-09-28T11:13:39Z

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.



Organisms That Use Photosynthesis

2016-09-28T11:13:39Z

Photosynthetic organisms are capable of generating organic compounds through photosynthesis. These organisms include plants, algae, and cyanobacteria.



25 Biology and Anatomy Activities to Liven Up...

2016-09-28T11:13:39Z

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 Are Biological Polymers?

2016-09-28T11:13:39Z

Biological polymers are large molecules composed of many smaller molecules linked together. Proteins and nucleic acids are two examples of polymers.



What Is Chromatin?

2016-09-28T11:13:39Z

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



Human Anatomy Study Tips

2016-09-28T11:13:39Z

Anatomy is the study of the structure of living organisms on a large and small scale. The most important thing to understand when studying anatomy is the terminology.



What is a Capillary Fluid Exchange?

2016-09-28T11:13:39Z

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



What Everyone Should Know About White Blood Cells

2016-09-28T11:13:39Z

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



7 Differences Between Mitosis and Meiosis

2016-09-28T11:13:39Z

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.



The Anatomy of Your Heart

2016-09-28T11:13:39Z

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.



What Are the Functions of the Thalamus?

2016-09-28T11:13:39Z

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



Amino Acids: Protein Building Blocks

2016-09-28T11:13:39Z

Amino acids are the basic components of proteins. They are essential to life because the proteins they form are involved in virtually all cell functions.



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

2016-09-28T11:13:39Z

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 Functions of the Temporal Lobes?

2016-09-28T11:13:39Z

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



Golgi Apparatus: The Cell's Manufacturing and...

2016-09-28T11:13:39Z

The Golgi apparatus, also called the Golgi complex, is found in plant and animal cells. It processes and generates molecules for proper cell function.



Types of Fertilization in Sexual Reproduction

2016-09-28T11:13:39Z

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



Diffusion: Passive Transport and Facilitated...

2016-09-28T11:13:39Z

Diffusion is the tendency of molecules to spread into an available space. The diffusion of substances across a membrane is called passive transport.



Translation: Making Protein Synthesis Possible

2016-09-28T11:13:39Z

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



What Are Archaea?

2016-09-28T11:13:39Z

Organisms from the Domain Archaea can exists under some of the most extreme conditions. They can survive in extremely hot, acidic, or alkaline environments.



Circulatory System: Pulmonary and Systemic...

2016-09-28T11:13:39Z

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



Mitosis Glossary

2016-09-28T11:13:39Z

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



Different Types of Nervous Tissue

2016-09-28T11:13:39Z

Nervous tissue is the primary tissue of the central and peripheral nervous systems. Nervous tissue conducts nerve impulses and is composed of neurons.



Integumentary System and Skin Layers

2016-09-28T11:13:39Z

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 Are the Major Land Biomes?

2016-09-28T11:13:39Z

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



What is the Cerebellum?

2016-09-28T11:13:39Z

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



Know the Characteristics of Temperate...

2016-09-28T11:13:39Z

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



What's it Like in a Savanna Land Biome?

2016-09-28T11:13:39Z

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



Biology Basics: What Are Sex Cells?

2016-09-28T11:13:39Z

Sex cells are reproductive cells. Male and female sex cells are dramatically different in size and shape. Female ova are large and round, while male sperm resemble long, motile projectiles.



Bone Marrow Structure and Function

2016-09-28T11:13:39Z

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



What Is the Diencephalon?

2016-09-28T11:13:39Z

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



How Normal Cells Differ From Cancer Cells

2016-09-28T11:13:39Z

How do normal cells differ from cancer cells? Learn about the properties of normal cells versus cancer cells.



Parietal Lobes - Function and Location

2016-09-28T11:13:39Z

The parietal lobes are one of the four main divisions of each brain hemisphere. These lobes play a vital role in touch sensory information processing.