biology-dictionary_11-06-2009

Web site: http://www.phschool.com/science/biology_place/glossary/index.html This collection of over 1000 biological terms and de ...

Absorption spectrum The range of a pigment's ability to absorb various wavelengths of light. Abyssal zone The portion of the oce ...

Acid A substance that increases the hydrogen ion concentration in a solution. Acid precipitation Rain, snow, or fog that is more ...

Adaptation The evolution of features that make a group of organisms better suited to live and reproduce in their environment. Ad ...

Adipocytes Any of various cells found in adipose tissue that are specialized for the storage of fat. Also called adipocyte. Adna ...

Aestivation Cessation from or slowing of activity during the summer; especially slowing of metabolism in some animals Afferent B ...

Aleurone layer The outermost cell layer of the endosperm of the grains (seeds) of wheat and other grasses; when acted upon by gi ...

Allergic reaction An inflammatory response triggered by a weak antigen (an allergen) to which most individuals do not react; inv ...

Alveolus One of the deadend, multilobed air sacs that constitute the gas exchange surface of the lungs. Or One of the milk-secre ...

Amoeboid Moving or feeding by means of pseudopodia (temporary cytoplasmic protrusions from the cell body). AMP Abbreviation of a ...

Anabolism Within a cell or organism, the sum of all biosynthetic reactions (that is, chemical reactions in which larger molecule ...

Angiosperms A flowering plant, which forms seeds inside a protective chamber called an ovary. Animalia Animals are a major group ...

Antibiotic resistance Antibiotic resistance is the ability of a microorganism to withstand the effects of an antibiotic. It is a ...

Apical meristem Embryonic plant tissue in the tips of roots and in the buds of shoots that supplies cells for the plant to grow ...

Archenteron The central cavity of the gastrula, which ultimately becomes the intestinal or digestive cavity. Archegonium In plan ...

Aschelminth The Aschelminthes (also known as Aeschelminthes, Nemathelminthes, or Pseudocoelomata), closely associated with the P ...

Atomic number The number of protons in the nucleus of an atom, unique for each element and designated by a subscript to the left ...

Autogenesis model According to this model, eukaryotic cells evolved by the specialization of internal membranes originally deriv ...

Axile Situated along the central axis of an ovary having two or more locules. Axillary buds An embryonic shoot present in the an ...

Barr body A dense object lying along the inside of the nuclear envelope in female mammalian cells, representing an inactivated X ...