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Glossary of terms used on this site

Glossary of biology.

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Glossaries

Term Main definition
adaptive evolution
Glossaries - Biology glossary

increase in frequency of beneficial alleles and decrease in deleterious alleles due to selection

adaptive immunity
Glossaries - Biology glossary

immunity that has memory and occurs after exposure to an antigen either from a pathogen or a vaccination

adaptive radiation
Glossaries - Biology glossary

rapid branching through speciation of a phylogenetic tree into many closely related species

adaptive radiation
Glossaries - Biology glossary

speciation when one species radiates to form several other species

adaptive radiation
Glossaries - Biology glossary

rapid branching through speciation of a phylogenetic tree into many closely related species

Addison’s disease
Glossaries - Biology glossary

disorder caused by the hyposecretion of corticosteroids

adduction
Glossaries - Biology glossary

movement of the limbs inward after abduction

adenylate cyclase
Glossaries - Biology glossary

an enzyme that catalyzes the conversion of ATP to cyclic AMP

adhesion
Glossaries - Biology glossary

attraction between water molecules and other molecules

adrenal cortex
Glossaries - Biology glossary

outer portion of adrenal glands that produces corticosteroids

adrenal gland
Glossaries - Biology glossary

endocrine glands associated with the kidneys

adrenal medulla
Glossaries - Biology glossary

inner portion of adrenal glands that produces epinephrine and norepinephrine

adrenocorticotropic hormone (ACTH)
Glossaries - Biology glossary

hormone released by the anterior pituitary, which stimulates the adrenal cortex to release corticosteroids during the long-term stress response

adventitious
Glossaries - Biology glossary

describes an organ that grows in an unusual place, such as a roots growing from the side of a stem

adventitious root
Glossaries - Biology glossary

aboveground root that arises from a plant part other than the radicle of the plant embryo