Biology: Most Popular Articles
Animal cells are eukaryotic cells that contain various membrane-bound organelles.
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.
Definition of the term incomplete dominance.
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.
An allele is an alternative form of a gene.
In glycolysis, glucose is split into two molecules of a three-carbon sugar.
Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. Prokaryotes include bacteria and archaeans.
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell.
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 human body is made up of several organ systems that work together as one unit.
What is the relationship between chromosomes and sex? Sex is determined by the presence or absence of certain chromosomes.
The pineal gland is a pine cone shaped gland of the endocrine system that produces several important hormones including melatonin.
The cell membrane is a thin semi-permeable membrane that surrounds the cell's cytoplasm, enclosing its contents.
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.
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 nervous system can be divided into two parts, the central nervous system and the peripheral nervous system.
Mendel's Law of Segregation states that allele pairs separate during gamete formation, and randomly unite at fertilization.
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes.
The limbic system is responsible for controlling various functions in the body. Structures of this system include the hippocampus, hypothalamus, and thalamus.
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 amygdala is an almond shaped mass of nuclei located deep within the temporal lobe of the brain.
Definition of the word heterozygous.
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 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.
Take a journey into the cell to find out about the cell structure of both prokaryotic cells and eukaryotic cells.
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.
An introduction to the mechanisms of asexual reproduction in animals. Common forms of this type of reproduction include budding, gemmules, fragmentation, regeneration, and parthenogenesis.
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.
The Cell Theory is one of the basic principles of biology. It states that all living things are composed of cells.
Ribosomes are cell organelles that consist of RNA and proteins. They are responsible for assembling the proteins of the cell.
The endoplasmic reticulum is a network of tubules and flattened sacs that serve a variety of functions in the cell.
The cerebellum is the area of the hindbrain that controls motor movement coordination, balance, equilibrium and muscle tone.
DNA transcription is a process that involves the transcribing of genetic information from DNA to RNA.
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.
The medulla oblongata is a portion of the hindbrain that controls autonomic functions such as breathing, digestion and heart rate.
The corpus callosum is a thick band of nerve fibers that divides the cerebrum into left and right hemispheres.
The cerebral cortex is the layer of the brain often referred to as gray matter. It is the outer portion of the cerebrum.
The frontal lobes are one of the four main lobes or regions of the cerebral cortex.
Photosynthesis is a process in which light energy is used to produce sugar and other organic compounds.
An introduction to the mechanisms of sexual reproduction in animals.
Explore the structure and function of animal tissues, including connective tissue.
The Three Domain System is a system for classifying biological organisms. Under this system, organisms are classified into three domains and six kingdoms.
The cardiac cycle is the cycle of events that occurs as the heart contracts.
Protein synthesis is accomplished through a process called translation. In translation, RNA and ribosomes work together to produce proteins.
What is biology? Simply put, it is the study of life.
A stage-by-stage guide to the phases of mitosis. In interphase, the cell increases in mass in preparation for cell division.
Definition of the word homozygous.
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 skeletal system is the support system for the body. It gives the body shape, form, and mobility while providing protection for sensitive organs.
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.
Living organisms are classified into three Domains and into one of six Kingdoms of life.
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.
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.
Gametes are reproductive cells. These cells unite to form a new cell called a zygote.
Explore the structure and function of the nucleus in eukaryotic cells.
anatomy quiz, human anatomy
The cardiac cycle is the sequence of events that occurs when the heart beats.
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.
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.
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.
anatomy quiz, heart anatomy
Blood vessels are intricate networks of hollow tubes that transport blood throughout the entire body.
The presence or absence of certain identifiers on the surface of red blood cells determine human blood type.
For almost one hundred years scientists believed that brain cells don't regenerate, until now.
Nucleic acids allow organisms to transfer genetic information from one generation to the next.
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.
Also called leukocytes, white blood cells play an important role in the immune system by protecting the body from infectious agents.
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 pons serves as a communications and coordination center between the two hemispheres of the brain.
The nucleus is a cell structure that contains hereditary information, or DNA, and controls cellular growth and reproduction.
The heart is the organ that supplies blood and oxygen to all parts of the body.
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.
Genes are segments of DNA located on chromosomes. Genes contain the codes for the production of specific proteins.
Should you wash your hands with a hand sanitizer or soap and water?
A capillary is an extremely small blood vessel located within the tissues of the body.
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.
Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Page 2.
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.
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.
The pituitary gland is a small endocrine system organ that controls a multitude of important functions in the body.
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.
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.
A diploid cell is a cell that contains two sets of chromosomes.
Explore the structure and function of animal tissues, including epithelial tissue.
The cytoplasm is a clear substance that consists of all of the contents outside of the nucleus of a membrane bound cell.
Explore the structure and function of cardiac, smooth, and skeletal muscle tissue.
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.
Lymph nodes are specialized structures in the body that filter lymph fluid of harmful pathogens, cancer cells, and cellular waste.
The cerebral cortex is the outer covering of the cerebrum. It is the layer of the brain often referred to as gray matter.
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.
A haploid cell is a cell that contains one complete set of chromosomes.
Bacterial reproduction most commonly occurs by a kind of cell division called binary fission. Other forms of bacterial reproduction include conjugation, transformation, and transduction.
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.
Taxonomy is a hierarchical system for classifying and identifying organisms.
Sex cells are male and female reproductive cells. They are produced through the cell division process of meiosis.
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 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.
Parts of a Flowering Plant Quiz Take Our Quiz About Flowering Plants Sorry, but this quiz requires that
Information and resources pertaining to the coronary arteries of the heart.
Homeostasis is the ability to maintain a constant internal environment in response to environmental changes.
Lymphatic system structures collect, filter, and return lymph to blood circulation.
Learn about the characteristics and parts of a flowering plant.
The thymus is a small glandular structure that regulates the immune system through the production of specific immune cells called lymphocytes.
Biological evolution is defined as any genetic change in a population that is inherited over several generations.
an easy way to make a working model of the lungs
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.
Sex chromosome abnormalities occur as a result of chromosome mutations brought on by mutagens or problems that occur during meiosis.
Need help studying for biology? I've got some great biology study tips for you.
Try this simple demonstration that shows how to make a working lung model.
Explore the structure and function of nervous tissue and neurons, also called nerve cells.
The diencephalon, along with the telencephalon comprise the two major divisions of forebrain.
The cell membrane is a thin semi-permeable membrane that surrounds the cytoplasm of a cell, enclosing its contents.
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.
Drinking too much alcohol can lead to alcohol hangover. Learn about alcohol hangover symptoms and how to prevent hangover.
Learn about virus replication and how viruses infect cells.
How do normal cells differ from cancer cells? Learn about the properties of normal cells versus cancer cells.
cellular respiration, quiz
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).
The occipital lobes are positioned at the back region of the cerebral cortex and are the main centers for visual processing.
Lipids are very diverse in both their respective structures and functions. Examples of lipids include fats, phospholipids, steroids and waxes.
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.
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.
Information and resources pertaining to the pulmonary artery of the heart.
Cells grow and replicate through an ordered series of events called the cell cycle.
The ventricles of the heart function to pump blood to the entire body.
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.
The following project ideas using plants provide suggestions for topics that can be explored through experimentation.
Here are some excellent tips to help you learn how to study for biology exams.
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.
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.
Information and resources pertaining to the aorta of the heart.
Centrioles are cylindrical structures that are composed of groupings of microtubules. Centrioles are found in animal cells and play a role in cell division.
Information and resources pertaining to the basal ganglia
In genetic variation, the alleles of organisms within a population change.
Learn about the anatomy of the stomach and gastric motility, the filling and emptying of the stomach.
Information and resources pertaining to the human heart valves.
Information and resources pertaining to the human digestive system and nurtrient absorption.
Phenotype is defined as an organism's expressed physical traits. It is determined by an individual's genotype and expressed genes, random genetic variation, and environmental influences.
Definition of the term dihybrid cross.
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.
Chromatin is a mass of genetic material composed of DNA and proteins that condense to form chromosomes.
Become familiar with how steroid hormones work in the body to produce proteins.
This study guide introduces you to the basics of mitosis and the mitotic process.
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.