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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: Mon, 13 Mar 2017 11:57:20 +0000

 



10 Reasons Women Live Longer Than Men

2017-03-13T11:57:20Z

Women have a longer life expectancy than men. A major reason for this is due to differences in genetic make-up between men and women.



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

2017-03-13T11:57:20Z

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



All About Animal Cells

2017-03-13T11:57:20Z

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



What Is Incomplete Dominance in Genetics?

2017-03-13T11:57:20Z

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



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

2017-03-13T11:57:20Z

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



Discover What Occurs During the Stages of Meiosis

2017-03-13T11:57:20Z

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 Steps of Glycolysis

2017-03-13T11:57:20Z

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



Cell Membranes Function, Structure and...

2017-03-13T11:57:20Z

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.



How Chromosome Mutations Occur

2017-03-13T11:57:20Z

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.



What Is the Cell Theory?

2017-03-13T11:57:20Z

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.



3 Types of Specialized Plant Cells

2017-03-13T11:57:20Z

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.



The 3 Main Stages of Cellular Respiration

2017-03-13T11:57:20Z

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



The Anatomy of a Heart Beat

2017-03-13T11:57:20Z

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



Learn the Basic Anatomy of the Brain

2017-03-13T11:57:20Z

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



How Alleles Determine Traits

2017-03-13T11:57:20Z

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



What Allows Organisms to Transfer Their Genetic...

2017-03-13T11:57:20Z

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.



Stage-By-Stage Guide to Mitosis

2017-03-13T11:57:20Z

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



15 Differences Between Animal and Plant Cells

2017-03-13T11:57:20Z

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



What Are the 6 Kingdoms of Life?

2017-03-13T11:57:20Z

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



Four Cute Features Caused by Gene Mutations

2017-03-13T11:57:20Z

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



What Does Heterozygous Mean?

2017-03-13T11:57:20Z

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



What Is So Unique About Red Blood Cells?

2017-03-13T11:57:20Z

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



8 Different Types of Body Cells

2017-03-13T11:57:20Z

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



Learn What Independent Assortment Is Through...

2017-03-13T11:57:20Z

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 Is the Structure and Function of the...

2017-03-13T11:57:20Z

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



What Are Sex-Linked Traits and Genes?

2017-03-13T11:57:20Z

Sex linked traits originate from genes found on sex chromosomes. Hemophilia is an example of a common sex linked recessive disorder.



How Does DNA Transcription Work?

2017-03-13T11:57:20Z

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



7 Types of Proteins and Their Functions

2017-03-13T11:57:20Z

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



What Are the Functions of the Temporal Lobes?

2017-03-13T11:57:20Z

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



Blood and Other Types of Connective Tissue

2017-03-13T11:57:20Z

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



What Makes a Trait Homozygous?

2017-03-13T11:57:20Z

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



Mendel's Law of Independent Assortment - A...

2017-03-13T11:57:20Z

Definition of Mendel's law of independent assortment.



Brain Anatomy: Cerebral Cortex

2017-03-13T11:57:20Z

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



Using the 3 Domain System to Classify Organisms

2017-03-13T11:57:20Z

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



Cell Wall Structure and Function

2017-03-13T11:57:20Z

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



Steps of DNA Replication

2017-03-13T11:57:20Z

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



Broca's Area and Speech

2017-03-13T11:57:20Z

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



What is a Capillary Fluid Exchange?

2017-03-13T11:57:20Z

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



Monohybrid Cross: A Breeding Experiment

2017-03-13T11:57:20Z

Definition of the term monohybrid cross.



10 Facts We Should Know About Cells

2017-03-13T11:57:20Z

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



Bone Marrow Structure and Function

2017-03-13T11:57:20Z

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



Four Cerebral Cortex Lobes

2017-03-13T11:57:20Z

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



Why Is DNA Twisted?

2017-03-13T11:57:20Z

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.



5 Types of Specialized Plant Cells

2017-03-13T11:57:20Z

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



What Is a Dihybrid Cross?

2017-03-13T11:57:20Z

A dihybrid cross is breeding experiment between organisms that differ in two traits. The parent organisms have different allele pairs for these traits.



Why We Look Like Our Parents

2017-03-13T11:57:20Z

Have you ever wondered why you have the same eye color as your parent? Traits are inherited by the transmission of genes from parents to their young.



What Is the Diencephalon?

2017-03-13T11:57:20Z

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



Immune System Quiz

2017-03-13T11:57:20Z




What Are Homologous Chromosomes?

2017-03-13T11:57:20Z

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



What's the Role of the Central Nervous System?

2017-03-13T11:57:20Z

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.



Why Your Brain's Frontal Lobes Are Important

2017-03-13T11:57:20Z

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.



Afraid? Blame Your Amygdala

2017-03-13T11:57:20Z

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



What Is DNA?

2017-03-13T11:57:20Z

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.



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

2017-03-13T11:57:20Z

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



Heart Anatomy Quiz

2017-03-13T11:57:20Z




The Magic of Photosynthesis: How Plants Turn...

2017-03-13T11:57:20Z

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



Biology Basics: What Are Eukaryotic and...

2017-03-13T11:57:20Z

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



Prokaryotes: Bacteria and Archaeans

2017-03-13T11:57:20Z

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



The Limbic System and Our Emotions

2017-03-13T11:57:20Z

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.



How Nutrients Cycle Through The Environment

2017-03-13T11:57:20Z

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



Find Out About the Virus That Infects Bacteria

2017-03-13T11:57:20Z

A bacteriophage is a virus that infects bacteria.



What's the Function of the Thymus?

2017-03-13T11:57:20Z

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



What Is the Corpus Callosum?

2017-03-13T11:57:20Z

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



Ribosomes And Protein Synthesis

2017-03-13T11:57:20Z

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



Why Epithelial Tissue Is Important

2017-03-13T11:57:20Z

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



What Causes Swollen Lymph Nodes?

2017-03-13T11:57:20Z

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



How Sexual Reproduction Occurs in Animals

2017-03-13T11:57:20Z

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



The Anatomy of Your Heart

2017-03-13T11:57:20Z

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.



How to Format a Biology Lab Report

2017-03-13T11:57:20Z

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.



Biology Basics: Characteristics of Life

2017-03-13T11:57:20Z

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



What Are Asters?

2017-03-13T11:57:20Z

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



How Open vs Closed Circulatory Systems Function

2017-03-13T11:57:20Z

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.



The Truth About Cholesterol

2017-03-13T11:57:20Z

Due to its association with cardiovascular disease, cholesterol has been given a bad name. Although excess cholesterol levels can have a negative impact on the body, cholesterol is essential for a number of important functions.



How Chloroplasts Make Photosynthesis Possible

2017-03-13T11:57:20Z

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



What Are Sister Chromatids?

2017-03-13T11:57:20Z

Sister chromatids are two identical copies of a single replicated chromosome that are connected by a centromere and held together by special proteins.



The 3 Types of Muscle Tissue

2017-03-13T11:57:20Z

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 the Brainstem is Your Body's Motion...

2017-03-13T11:57:20Z

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 Is the Cytoskeleton?

2017-03-13T11:57:20Z

The cytoskeleton is a complex network of fibers that function in cell support and movement. It shapes the cell and holds organelles in place.



4 Sex Chromosome Abnormalities Caused by Mutation

2017-03-13T11:57:20Z

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



What Does Our Hypothalamus Do for Us?

2017-03-13T11:57:20Z

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.



4 Types of Protein Structure

2017-03-13T11:57:20Z

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



What You Need to Know About Organ Systems

2017-03-13T11:57:20Z

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 Mendel's Law of Segregation?

2017-03-13T11:57:20Z

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.



Quiz: How Familiar Are You With the Heart's...

2017-03-13T11:57:20Z

Take the Heart Anatomy Quiz and find out how much you know about the heart.



Biology Basics: What Are Sex Cells?

2017-03-13T11:57:20Z

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.



How the Pineal Gland Controls Your Biological...

2017-03-13T11:57:20Z

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



Gametes: The Building Blocks of Sexual...

2017-03-13T11:57:20Z

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



How Gene Mutation Occurs:

2017-03-13T11:57:20Z

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.



Differences Between Normal Cells and Cancer Cells

2017-03-13T11:57:20Z

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



How the Brain Defines Who You Are

2017-03-13T11:57:20Z

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.



Plant Cell Quiz

2017-03-13T11:57:20Z




Different Types of Nervous Tissue

2017-03-13T11:57:20Z

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



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

2017-03-13T11:57:20Z

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



Translation: Making Protein Synthesis Possible

2017-03-13T11:57:20Z

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



Diploid Cell: Double the Chromosome Number

2017-03-13T11:57:20Z

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.



7 Differences Between Mitosis and Meiosis

2017-03-13T11:57:20Z

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.



Why Organelles Are Important to Cells

2017-03-13T11:57:20Z

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.



What Are the Functions of the Thalamus?

2017-03-13T11:57:20Z

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



What You Should Know About Mitrochondria

2017-03-13T11:57:20Z

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



What Do You Know About Cellular Respiration?...

2017-03-13T11:57:20Z

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