A generic term for minute structures in a cell that have a particular function. Examples include: flagella, the nucleus, mitochondria, ribsomes and lysosomes (an enzyme in a membrane-bound sac in the cytoplasm required for the digestion of material in food, the destruction of foreign particles entering the cell, and the breakdown of all cell structures when it dies).
See Acrosome, Cell, Cytoplasm, Cytoskeleton, Enzyme, Eukaryote cell (or organism), Flagella, Golgi apparatus (body or complex or organ), Lamillipodia, Lysosomes, Microtubules, Mitochondria, Nucleus (of a cell), Prokaryote cell (or organism), Protoplasm, Ribsomes, Vesicles