1.a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
2.(in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
3.an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane.
4.a minute particle consisting of RNA and associated proteins found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.
5.a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.
