Cell biology

Cell biology

The study of cell structure, physiological properties, interactions with the environment and life cycle.

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Cell biology

sporangia

Biology; Cell biology

The structures in which spores are produced (sing. : sporangium).

pyloric sphincter

Biology; Cell biology

The ring of muscle at the junction of the stomach and small intestine that regulates the movement of food into the small intestine.

molecules

Biology; Cell biology

Units of two or more atoms held together by chemical bonds. The combination of atoms by chemical bonds with the component atoms in definite porportions, such as water (two H to one O).

half-life

Biology; Cell biology

The time required for one-half of an original unstable radioactive element to be converted to a more stable daughter element.

geological time

Biology; Cell biology

The span of time that has passed since the formation of the Earth and its physical structures; also, a timescale that focuses on events on the order of thousands of years or more.