Biology: Most Popular Articles
The human body is made up of several organ systems that work together as one unit.
Animal cells are eukaryotic cells that contain various membrane-bound organelles.
Proteins are very important molecules in our cells. Each protein within the body has a specific function.
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.
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 biology? Simply put, it is the study of life.
In glycolysis, glucose is split into two molecules of a three-carbon sugar.
The cell membrane is a thin semi-permeable membrane that surrounds the cell's cytoplasm, enclosing its contents.
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell.
Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. Prokaryotes include bacteria and archaeans.
Living organisms are classified into three Domains and into one of six Kingdoms of life.
The Cell Theory is one of the basic principles of biology. It states that all living things are composed of cells.
An allele is an alternative form of a gene.
The skeletal system is the support system for the body. It gives the body shape, form, and mobility while providing protection for sensitive organs.
In asexual reproduction, one individual produces offspring that are genetically identical to itself. Common forms of asexual reproduction include budding, regeneration, and parthenogenesis.
The nervous system can be divided into two parts, the central nervous system and the peripheral nervous system.
Ribosomes are cell organelles that consist of RNA and proteins. They are responsible for assembling the proteins of the cell.
Due to its intricate structure and function, the anatomy of the brain is complex. This resource provides information on brain anatomy, the central nervous system, and brain function.
Here are some great ideas for biology science fair projects including projects related to animals, plants and the human body.
The following 10 facts about cells will provide you with well known and perhaps little known tidbits of information about cells.
The endoplasmic reticulum is a network of tubules and flattened sacs that serve a variety of functions in the cell.
Take a journey into the cell to find out about the cell structure of both prokaryotic cells and eukaryotic cells.
What is the relationship between chromosomes and sex? Sex is determined by the presence or absence of certain chromosomes.
The Three Domain System is a system for classifying biological organisms. Under this system, organisms are classified into three domains and six kingdoms.
Explore the structure and function of animal tissues, including connective tissue.
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.
A chloroplast is a chlorophyll containing organelle found in plant cells and some green algae. Chloroplasts convert light energy into chemical energy by the process of photosynthesis.
The pineal gland is a pine cone shaped gland of the endocrine system that produces several important hormones including melatonin.
Photosynthesis is a process in which light energy is used to produce sugar and other organic compounds.
Cellular respiration is a process by which cells harvest the energy stored in food. Glycolysis, the citric acid cycle, and electron transport are the three main processes of cellular respiration.
Explore the structure and function of the nucleus in eukaryotic cells.
This stage-by-stage guide to the phases of meiosis provides details about the events that occur in each of the stages of meiosis.
The limbic system is responsible for controlling various functions in the body. Structures of this system include the hippocampus, hypothalamus, and thalamus.
Definition of the term incomplete dominance.
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.
Biology lab safety rules are guidelines designed to help keep you safe when experimenting. It is always wise to follow all lab safety rules.
The cerebellum is the area of the hindbrain that controls motor movement coordination, balance, equilibrium and muscle tone.
The amygdala is an almond shaped mass of nuclei located deep within the temporal lobe of the brain.
An introduction to the mechanisms of sexual reproduction in animals.
The hippocampus is the part of the brain that is involved in memory forming, organizing, and storing. It is a limbic system structure that is particularly important in forming new memories and connecting emotions and senses, such as smell and sound, to memories.
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes.
Mendel's Law of Segregation states that allele pairs separate during gamete formation, and randomly unite at fertilization.
DNA transcription is a process that involves the transcribing of genetic information from DNA to RNA.
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.
The frontal lobes are one of the four main lobes or regions of the cerebral cortex.
The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world.
Nucleic acids allow organisms to transfer genetic information from one generation to the next.
Homeostasis is the ability to maintain a constant internal environment in response to environmental changes.
The cerebrum is the largest portion of the brain. It encompasses about two-thirds of the brain mass and lies over and around most of the structures of the brain.
Plant tissue systems are composed of dermal tissue, vascular tissue, and ground tissue systems. These systems provide support, nutrient formation and transportation, growth, and protection for a plant.
Protein synthesis is accomplished through a process called translation. In translation, RNA and ribosomes work together to produce proteins.
Sex linked traits originate from genes found on sex chromosomes. Hemophilia is an example of a common sex linked disorder that is an X linked recessive trait.
Should you wash your hands with a hand sanitizer or soap and water?
A stage-by-stage guide to the phases of mitosis. In interphase, the cell increases in mass in preparation for cell division.
The medulla oblongata is a portion of the hindbrain that controls autonomic functions such as breathing, digestion and heart rate.
The integumentary system consists of the largest organ in the body, the skin. This extraordinary organ system protects the internal structures of the body from damage, prevents dehydration, stores fat and produces vitamins and hormones.
Before sitting down to enjoy that holiday turkey meal, I believe it is appropriate to pay tribute to this splendid bird by discovering some interesting turkey facts.
The cardiac cycle is the cycle of events that occurs as the heart contracts.
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 this amazing organ.
There have a number of important specialized types of plant cells. Some examples of specialized plant cells include parenchyma cells, collenchyma cells and sclerenchyma cells.
anatomy quiz, human anatomy
The corpus callosum is a thick band of nerve fibers that divides the cerebrum into left and right hemispheres.
anatomy quiz, heart anatomy
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 and also regulates endocrine system hormones.
The thalamus is a large, dual lobed mass of grey matter buried under the cerebral cortex. It is involved in sensory perception and regulation of motor functions.
The cytoplasm is a clear substance that consists of all of the contents outside of the nucleus of a membrane bound cell.
Taxonomy is a hierarchical system for classifying and identifying organisms.
The cerebral cortex is the layer of the brain often referred to as gray matter. It is the outer portion of the cerebrum.
The Golgi complex, also called the Golgi apparatus, is a membranous structure found in plant and animal cells. It processes, sorts, and generates molecules necessary for proper cell function.
Definition of the word heterozygous.
The cell membrane is a thin semi-permeable membrane that surrounds the cytoplasm of a cell, enclosing its contents.
Explore the structure and function of cardiac, smooth, and skeletal muscle tissue.
Also called leukocytes, white blood cells play an important role in the immune system by protecting the body from infectious agents.
Blood vessels are intricate networks of hollow tubes that transport blood throughout the entire body.
For almost one hundred years scientists believed that brain cells don't regenerate, until now.
Explore the structure and function of animal tissues, including epithelial tissue.
The cardiovascular system is responsible for transporting nutrients and removing gaseous waste from the body. This system is comprised of the heart and the circulatory system.
The nucleus is a cell structure that contains hereditary information, or DNA, and controls cellular growth and reproduction.
Red blood cells are blood components that transport oxygen throughout the body. Also called erythrocytes, these cells contain hundreds of millions of oxygen-binding hemoglobin molecules.
Biological evolution is defined as any genetic change in a population that is inherited over several generations.
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 cardiac cycle is the sequence of events that occurs when the heart beats.
Bacterial reproduction most commonly occurs by a kind of cell division called binary fission. Other forms of bacterial reproduction include conjugation, transformation, and transduction.
Lipids are very diverse in both their respective structures and functions. Examples of lipids include fats, phospholipids, steroids and waxes.
Need help studying for biology? I've got some great biology study tips for you. Just following these simple steps will make studying less stressful.
Lymph nodes are specialized structures in the body that filter lymph fluid of harmful pathogens, cancer cells, and cellular waste.
The pituitary gland is a small endocrine system organ that controls a multitude of important functions in the body.
The presence or absence of certain identifiers on the surface of red blood cells determine human blood type.
The heart is the organ that supplies blood and oxygen to all parts of the body.
Lymphatic system structures collect, filter, and return lymph to blood circulation.
The temporal lobes are one of the four main lobes or regions of the cerebral cortex. The temporal lobes play an important role in organizing sensory input, auditory perception and memory.
Anatomy is the study of the structure of living organisms. This subdiscipline of biology can be further categorized into the study of large scale anatomical structures (gross anatomy) and the study of microscopic anatomical structures (microscopic anatomy).
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.
The thymus is a small glandular structure that regulates the immune system through the production of specific immune cells called lymphocytes.
Explore the structure and function of nervous tissue and neurons, also called nerve cells.
Learn about virus replication and how viruses infect cells.
Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Page 2.
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.
A capillary is an extremely small blood vessel located within the tissues of the body.
Learn about the characteristics and parts of a flowering plant.
Gametes are reproductive cells. These cells unite to form a new cell called a zygote.
Definition of the word homozygous.
In sexual reproduction, fertilization involves the donation of genes from two parents which results in the production of offspring with a mix of inherited genes.
an easy way to make a working model of the lungs
A chromosome is a long, stringy aggregate of genes that carries heredity information and is formed from condensed chromatin.
Broca's area is one of the main areas of the cerebral cortex responsible for producing language.
Try this simple demonstration that shows how to make a working lung model.
Cells grow and replicate through an ordered series of events called the cell cycle.
The occipital lobes are positioned at the back region of the cerebral cortex and are the main centers for visual processing.
The following project ideas using plants provide suggestions for topics that can be explored through experimentation.
Centrioles are cylindrical structures that are composed of groupings of microtubules. Centrioles are found in animal cells and play a role in cell division.
A vein is an elastic blood vessel that transports blood from various regions of the body to the heart. Veins can be categorized into pulmonary, systemic, superficial, and deep veins.
Parts of a Flowering Plant Quiz Take Our Quiz About Flowering Plants Sorry, but this quiz requires that
The pons serves as a communications and coordination center between the two hemispheres of the brain.
If you are taking a biology course, you are going to write biology lab reports. Find information about using a good lab report format to properly write a lab report.
How do normal cells differ from cancer cells? Learn about the properties of normal cells versus cancer cells.
Sex cells are male and female reproductive cells. They are produced through the cell division process of meiosis.
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.
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.
Information and resources pertaining to the coronary arteries of the heart.
The cerebral cortex is the outer covering of the cerebrum. It is the layer of the brain often referred to as gray matter.
A diploid cell is a cell that contains two sets of chromosomes.
Genes are segments of DNA located on chromosomes. Genes contain the codes for the production of specific proteins.
A haploid cell is a cell that contains one complete set of chromosomes.
All cells of the nervous system are comprised of neurons. Neurons are responsible for sending, receiving, and interpreting information from all parts of the body.
An artery is an elastic blood vessel that transports blood away from the heart. Pulmonary and systemic arteries are two main types of arteries.
Information and resources pertaining to the pericardium of the human heart.
The spinal cord is a cylindrical shaped bundle of nerve fibers that convey messages to and from the brain. The spongy spinal cord is protected by the irregular shaped bones of the spinal column called vertebrae.
Drinking too much alcohol can lead to alcohol hangover. Learn about alcohol hangover symptoms and how to prevent hangover.
Lymphocytes are a type of white blood cell that provide a means for specific and nonspecific immunity. They circulate in blood and lymph fluids and defend the body against cancerous cells, pathogens, and foreign matter.
The lungs are the organs responsible for breathing, the alternate inhalation and exhalation of air. The heart and lungs work together to provide oxygen to the cells of the body.
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Sex chromosome abnormalities occur as a result of chromosome mutations brought on by mutagens or problems that occur during meiosis.
Chromatin is a mass of genetic material composed of DNA and proteins that condense to form chromosomes.
Here are some excellent tips to help you learn how to study for biology exams.
Have you ever wondered what causes your heart to beat? Learn about the four steps of cardiac conduction, the rate at which the heart conducts electrical impulses.
The ventricles of the heart function to pump blood to the entire body.
Bone marrow is the soft tissue found inside bones that functions mainly to produce red blood cells, white blood cells, and platelets.
The brain is one of the largest and most important organs of the human body. Weighing in at about three pounds, this organ has a wide range of responsibilities.
Viruses are unique in that they have been classified as both living and nonliving at various points in the history biology. Learn about virus structure, DNA, capsids and more.
The diencephalon, along with the telencephalon comprise the two major divisions of forebrain.
Temperate grasslands are savanna-like areas located in cold climate regions.
Information and resources pertaining to the aorta of the heart.
Carbohydrates are one of the four major classes of organic compounds in living cells. The term carbohydrate is used when referring to a saccharide or sugar and its derivatives.
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.
Get answers to frequently asked biology related questions.
Information on bile secretion and digestion.: bile acids fat soluble vitamins bile ducts small intestine organic molecules
In genetic variation, the alleles of organisms within a population change.