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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, 27 Feb 2017 11:33:55 +0000

 



10 Reasons Women Live Longer Than Men

2017-02-27T11:33:55Z

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.



All About Animal Cells

2017-02-27T11:33:55Z

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



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

2017-02-27T11:33:55Z

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



Cell Membranes Function, Structure and...

2017-02-27T11:33:55Z

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.



15 Differences Between Animal and Plant Cells

2017-02-27T11:33:55Z

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



What Is Incomplete Dominance in Genetics?

2017-02-27T11:33:55Z

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



The Anatomy of a Heart Beat

2017-02-27T11:33:55Z

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

2017-02-27T11:33:55Z

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



Discover What Occurs During the Stages of Meiosis

2017-02-27T11:33:55Z

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.



8 Different Types of Body Cells

2017-02-27T11:33:55Z

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 Are the 6 Kingdoms of Life?

2017-02-27T11:33:55Z

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



The 3 Main Stages of Cellular Respiration

2017-02-27T11:33:55Z

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



3 Types of Specialized Plant Cells

2017-02-27T11:33:55Z

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

2017-02-27T11:33:55Z

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



What Is the Cell Theory?

2017-02-27T11:33:55Z

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.



10 Facts We Should Know About Cells

2017-02-27T11:33:55Z

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



What Is the Structure and Function of the...

2017-02-27T11:33:55Z

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



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

2017-02-27T11:33:55Z

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



How Alleles Determine Traits

2017-02-27T11:33:55Z

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 Is So Unique About Red Blood Cells?

2017-02-27T11:33:55Z

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



6 Things You Should Know About Biological...

2017-02-27T11:33:55Z

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



Biology Basics: What Are Eukaryotic and...

2017-02-27T11:33:55Z

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



Four Cute Features Caused by Gene Mutations

2017-02-27T11:33:55Z

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



Blood and Other Types of Connective Tissue

2017-02-27T11:33:55Z

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



Stage-By-Stage Guide to Mitosis

2017-02-27T11:33:55Z

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



Using the 3 Domain System to Classify Organisms

2017-02-27T11:33:55Z

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



7 Types of Proteins and Their Functions

2017-02-27T11:33:55Z

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 Allows Organisms to Transfer Their Genetic...

2017-02-27T11:33:55Z

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.



What Does Heterozygous Mean?

2017-02-27T11:33:55Z

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



How Chromosome Mutations Occur

2017-02-27T11:33:55Z

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.



How Does DNA Transcription Work?

2017-02-27T11:33:55Z

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



4 Main Parts of a Flowering Plant

2017-02-27T11:33:55Z

Flowering plants are the most numerous of all the divisions in the Plant Kingdom. Learn about the characteristics and parts of a flowering plant.



Cell Wall Structure and Function

2017-02-27T11:33:55Z

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



Afraid? Blame Your Amygdala

2017-02-27T11:33:55Z

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



The Limbic System and Our Emotions

2017-02-27T11:33:55Z

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

2017-02-27T11:33:55Z

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 Makes a Trait Homozygous?

2017-02-27T11:33:55Z

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



Why We Look Like Our Parents

2017-02-27T11:33:55Z

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.



Learn What Independent Assortment Is Through...

2017-02-27T11:33:55Z

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 a Capillary Fluid Exchange?

2017-02-27T11:33:55Z

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



Ribosomes And Protein Synthesis

2017-02-27T11:33:55Z

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



White, Brown, and Beige Fat

2017-02-27T11:33:55Z

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.



Steps of DNA Replication

2017-02-27T11:33:55Z

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



Prokaryotes: Bacteria and Archaeans

2017-02-27T11:33:55Z

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



Why the Peripheral Nervous System Is Important

2017-02-27T11:33:55Z

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



How to Format a Biology Lab Report

2017-02-27T11:33:55Z

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.



5 Types of Specialized Plant Cells

2017-02-27T11:33:55Z

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



Four Cerebral Cortex Lobes

2017-02-27T11:33:55Z

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



What Is the Corpus Callosum?

2017-02-27T11:33:55Z

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



What Are the Functions of the Temporal Lobes?

2017-02-27T11:33:55Z

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



4 Types of Protein Structure

2017-02-27T11:33:55Z

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



The Magic of Photosynthesis: How Plants Turn...

2017-02-27T11:33:55Z

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



Brain Anatomy: Cerebral Cortex

2017-02-27T11:33:55Z

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



What You Need to Know About Organ Systems

2017-02-27T11:33:55Z

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



Monohybrid Cross: A Breeding Experiment

2017-02-27T11:33:55Z

Definition of the term monohybrid cross.



What Are Homologous Chromosomes?

2017-02-27T11:33:55Z

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



Broca's Area and Speech

2017-02-27T11:33:55Z

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



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

2017-02-27T11:33:55Z

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.



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

2017-02-27T11:33:55Z

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



The Anatomy of Your Heart

2017-02-27T11:33:55Z

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 Angiosperms?

2017-02-27T11:33:55Z

Angiosperms, or flowering plants, are the most numerous of all the divisions in the Plant Kingdom.



What's the Role of the Central Nervous System?

2017-02-27T11:33:55Z

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.



What Is the Diencephalon?

2017-02-27T11:33:55Z

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



What Is a Dihybrid Cross?

2017-02-27T11:33:55Z

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



Bone Marrow Structure and Function

2017-02-27T11:33:55Z

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



25 Biology and Anatomy Activities to Liven Up...

2017-02-27T11:33:55Z

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.



How Gene Mutation Occurs:

2017-02-27T11:33:55Z

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 Are the Functions of the Thalamus?

2017-02-27T11:33:55Z

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



How Open vs Closed Circulatory Systems Function

2017-02-27T11:33:55Z

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.



How Sexual Reproduction Occurs in Animals

2017-02-27T11:33:55Z

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



What Are Sex-Linked Traits and Genes?

2017-02-27T11:33:55Z

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



Circulatory System: Pulmonary and Systemic...

2017-02-27T11:33:55Z

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



What's the Function of the Thymus?

2017-02-27T11:33:55Z

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



Types of Fertilization in Sexual Reproduction

2017-02-27T11:33:55Z

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



Gametes: The Building Blocks of Sexual...

2017-02-27T11:33:55Z

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



How Chloroplasts Make Photosynthesis Possible

2017-02-27T11:33:55Z

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



Layers of the Heart Wall

2017-02-27T11:33:55Z

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



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

2017-02-27T11:33:55Z

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



22 Ideas for Science Experiments Using Plants

2017-02-27T11:33:55Z

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



Why Organelles Are Important to Cells

2017-02-27T11:33:55Z

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 Sister Chromatids?

2017-02-27T11:33:55Z

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



What Is Chromatin?

2017-02-27T11:33:55Z

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



Biology Basics: Characteristics of Life

2017-02-27T11:33:55Z

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



Diploid Cell: Double the Chromosome Number

2017-02-27T11:33:55Z

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.



What Is DNA?

2017-02-27T11:33:55Z

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.



The 3 Types of Muscle Tissue

2017-02-27T11:33:55Z

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 Mendel's Law of Segregation?

2017-02-27T11:33:55Z

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.



What You Should Know About Mitrochondria

2017-02-27T11:33:55Z

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



3 Major Lipid Groups

2017-02-27T11:33:55Z

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?

2017-02-27T11:33:55Z

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.



Glossary of Cell Biology Terms

2017-02-27T11:33:55Z

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 Is the Cytoskeleton?

2017-02-27T11:33:55Z

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



Cell Model and Structure of the Endoplasmic...

2017-02-27T11:33:55Z

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



Translation: Making Protein Synthesis Possible

2017-02-27T11:33:55Z

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



4 Sex Chromosome Abnormalities Caused by Mutation

2017-02-27T11:33:55Z

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



What is the Cerebellum?

2017-02-27T11:33:55Z

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



Why Your Brain's Frontal Lobes Are Important

2017-02-27T11:33:55Z

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.



Why Is DNA Twisted?

2017-02-27T11:33:55Z

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.



What Is the Function of the Aorta?

2017-02-27T11:33:55Z

The aorta of the heart is the body's largest artery. It extends from the heart to the abdominal region to supply oxygen rich blood to the body.



Do You Have Stellar Memory? It May Be Your...

2017-02-27T11:33:55Z

The hippocampus is the part of the brain that is involved in memory formation, memory organization, and memory storing. It is a limbic system structure.