cell nucleus

center of a cell which contains genes and chromosomes

In cell biology, the nucleus (pl. nuclei; from Latin  or , kernel) is a membrane-enclosed organelle found in most eukaryotic cells. It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these chromosomes make up the cell's nuclear genome. The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression.
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Noun
1. a part of the cell containing DNA and RNA and responsible for growth and reproduction
(synonym) nucleus, karyon
(hypernym) organelle, cell organ
(hyponym) pronucleus
(part-holonym) cell
(substance-meronym) nucleoplasm, karyoplasm
(part-meronym) nucleolus, nucleole