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Glossary of terms used on this site

Glossary of biology.

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Glossaries

Term Main definition
postzygotic barrier
Glossaries - Biology glossary

reproductive isolation mechanism that occurs after zygote formation

potential energy
Glossaries - Biology glossary

energy type that has the potential to do work; stored energy

potocytosis
Glossaries - Biology glossary

variation of pinocytosis that uses a different coating protein (caveolin) on the plasma membrane's cytoplasmic side

precapillary sphincter
Glossaries - Biology glossary

small muscle that controls blood circulation in the capillary beds

precapillary sphincter
Glossaries - Biology glossary

small muscle that controls blood circulation in the capillary beds

predator
Glossaries - Biology glossary

organism that kills and consumes another organism

preinitiation complex
Glossaries - Biology glossary

cluster of transcription factors and other proteins that recruit RNA polymerase II for transcription of a DNA template

presbyopia
Glossaries - Biology glossary

visual defect in which the image focus falls behind the retina, thereby making images in the distance clear, but close-up images blurry; caused by age-based changes in the lens

prezygotic barrier
Glossaries - Biology glossary

reproductive isolation mechanism that occurs before zygote formation

primary active transport
Glossaries - Biology glossary

active transport that moves ions or small molecules across a membrane and may create a difference in charge across that membrane

primary active transport
Glossaries - Biology glossary

active transport that moves ions or small molecules across a membrane and may create a difference in charge across that membrane

primary bronchus
Glossaries - Biology glossary

(also, main bronchus) region of the airway within the lung that attaches to the trachea and bifurcates to each lung where it branches into secondary bronchi

primary consumer
Glossaries - Biology glossary

trophic level that obtains its energy from the primary producers of an ecosystem

primary electron acceptor
Glossaries - Biology glossary

pigment or other organic molecule in the reaction center that accepts an energized electron from the reaction center

primary feather
Glossaries - Biology glossary

feather located at the tip of the wing that provides thrust