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(genetic biology)

Grammar: noun
plural: vacuoles
Definition: a tiny cavity in the cytoplasm of a cell, filled with fluid (food, water and metabolic waste)
Example:
1. Especially in protozoans, vacuoles perform functions such as storage, ingestion, digestion, excretion, and expulsion of excess water.

2. To counter the effect of water influx, Paramecium needs a mechanism to remove excess water from the cytoplasm; this function is carried out by contractile vacuoles.