General

General

General nature or nature terms.

Industry: Natural environment

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General

prokaryote

Biology; General

Type of cell that lacks a membrane-bound nucleus and has no membrane organelles; a bacterium. Prokaryotes are more primitive than eukaryotes. Cells lacking membrane-bound organelles and having a ...

photosynthesis

Biology; General

The process by which plant cells use solar energy to produce ATP. The conversion of unusable sunlight energy into usable chemical energy, associated with the actions of chlorophyll.

precipitation

Biology; General

The part of the hydrologic cycle in which the water vapor in the atmosphere falls to Earth as rain or snow.

predation

Biology; General

One of the biological interactions that can limit population growth; occurs when organisms kill and consume other living organisms.

prolactin

Biology; General

A hormone produced by the anterior pituitary; secreted at the end of pregnancy when it activates milk production by the mammary glands.

photosystems

Biology; General

Clusters of several hundred molecules of chlorophyll in a thylakoid in which photosynthesis takes place. Eukaryotes have two types of photosystems: I and II. The series of green photoreceptive ...