nucleolus (redirected from nucleolus organizer site)

nu·cle·o·lus  (n-kl-ls, ny-)

n. pl. nu·cle·o·li (-l) Biology

A small, typically round granular body composed of protein and RNA in the nucleus of a cell. It is usually associated with a specific chromosomal site and involved in ribosomal RNA synthesis and the formation of ribosomes.

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[New Latin, from Latin, diminutive of nucleus, kernel; see nucleus.]

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nu·cleo·lar (-lr) adj.

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nucleolus [ˌnjuːklɪˈəʊləs]

n pl -li [-laɪ]

(Life Sciences & Allied Applications / Biology) a small rounded body within a resting nucleus that contains RNA and proteins and is involved in the production of ribosomes Also called 'nucle"ole

[from Latin, diminutive of nucleus]

nucleolar , nucleolate, nucleolated adj

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nucleolus  (n-kl-ls)

Plural nucleoli (n-kl-l)

A small, typically spherical granular body located in the nucleus of a eukaryotic cell, composed largely of protein and RNA. When the cell is not undergoing division, loops of DNA from one or more chromosomes extend into the nucleolus and direct the synthesis of ribosomal RNA and the formation of ribosomes. The ribosomes are eventually transferred out of the nucleus via pores in the nuclear envelope into the cytoplasm.

Thesaurus

Noun

1.

nucleolus - a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis nucleole cell nucleus, karyon, nucleus - a part of the cell containing DNA and RNA and responsible for growth and reproduction cell organ, cell organelle, organelle - a specialized part of a cell; analogous to an organ; "the first organelle to be identified was the nucleus"