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Biology is the study of living things. It is broken down into many fields, reflecting the complexity of life from the atoms and molecules of biochemistry to the interactions of millions of organisms in ecology. This biology dictionary is here to help you learn about all sorts of biology terms, principles, and life forms.
Producer Definition. Producers are organisms capable of creating simple carbohydrates such as glucose, from gaseous carbon dioxide. This process of producing organic molecules from inorganic carbon sources is called primary production. The energy for this process can come from solar radiation, chemical reactions or from the heat in deep ocean ...
Polar Molecule Definition. A polar molecule is a chemical species in which the distribution of electrons between the covalently bonded atoms is not even. Polarity is a description of how different the electrical poles of a molecule are. If they are highly different, it can be said that the species is a highly polar molecule.
Organ Definition. An organ is a self-contained group of tissues that performs a specific function in the body. The heart, liver, and stomach are examples of organs in humans. The word organ comes from the Latin organum, which means “instrument”. This in turn comes from the Greek word ὄργανον (órganon), which refers to a musical ...
Definition. An ecosystem or biome describes a single environment and every living (biotic) organism and non-living (abiotic) factor that is contained within it or characterizes it. An ecosystem embodies every aspect of a single habitat, including all interactions between its different elements.
Human Biology Definition. Human biology is the branch of biology that focuses on human beings and human populations; it encompasses all aspects of the human organism including genetics, ecology, anatomy and physiology, anthropology, and nutrition, among others. Human biology is related to other fields of biology such as medicine, primate ...
Population Definition. A population is the number of organisms of the same species that live in a particular geographic area at the same time, with the capability of interbreeding. For interbreeding to occur, individuals must be able to mate with any other member of a population and produce fertile offspring.
Parasitism Definition. Parasitism is a type of symbiotic relationship, or long-term relationship between two species, where one member, the parasite, gains benefits that come at the expense of the host member. The word parasite comes from the Latin form of the Greek word παράσιτος (parasitos), meaning “one who eats at the table of ...
Golgi Apparatus Definition. The Golgi apparatus is an organelle in eukaryotic organisms that moves molecules from the endoplasmic reticulum to their destination. The organelle also modifies products of the endoplasmic reticulum to their final form. The Golgi apparatus is comprised of a series of flattened sacs that extend from the endoplasmic ...
Autotroph Definition. Autotrophs are organisms that can produce their own food, using materials from inorganic sources. The word “autotroph” comes from the root words “auto” for “self” and “troph” for “food.”. An autotroph is an organism that feeds itself, without the assistance of any other organisms.