Glossary of terms used on this site

Glossary of biology.

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Glossaries

Term Main definition
G-protein
Glossaries - Biology glossary

a membrane protein activated by the hormone first messenger to activate formation of cyclic AMP

G-protein-linked receptor
Glossaries - Biology glossary

cell-surface receptor that activates membrane-bound G-proteins to transmit a signal from the receptor to nearby membrane components

gall
Glossaries - Biology glossary

appearance of a plant tumor

gallbladder
Glossaries - Biology glossary

organ that stores and concentrates bile

gametangium
Glossaries - Biology glossary

structure on the gametophyte in which gametes are produced

gametic barrier
Glossaries - Biology glossary

prezygotic barrier occurring when closely related individuals of different species mate, but differences in their gamete cells (eggs and sperm) prevent fertilization from taking place

gametophyte
Glossaries - Biology glossary

a multicellular haploid life-cycle stage that produces gametes

gametophyte
Glossaries - Biology glossary

multicellular stage of the plant that gives rise to haploid gametes or spores

gap junction
Glossaries - Biology glossary

channel between two adjacent animal cells that allows ions, nutrients, and low molecular weight substances to pass between cells, enabling the cells to communicate

gastric inhibitory peptide
Glossaries - Biology glossary

hormone secreted by the small intestine in the presence of fatty acids and sugars; it also inhibits acid production and peristalsis in order to slow down the rate at which food enters the small intestine

gastric phase
Glossaries - Biology glossary

digestive phase beginning once food enters the stomach; gastric acids and enzymes process the ingested materials

gastrin
Glossaries - Biology glossary

hormone which stimulates hydrochloric acid secretion in the stomach

gastrodermis
Glossaries - Biology glossary

inner layer (from endoderm) that lines the digestive cavity

gastrovascular cavity
Glossaries - Biology glossary

opening that serves as both a mouth and an anus, which is termed an incomplete digestive system

gastrovascular cavity
Glossaries - Biology glossary

digestive system consisting of a single opening

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