A nucleosome is a basic unit of DNA packaging in eukaryotes, consisting of a segment of DNA wound in sequence around eight histone protein cores. This structure is often compared to thread wrapped around a spool. Nucleosomes form the fundamental repeating units of eukaryotic chromatin, which is used to pack the large eukaryotic genomes into the nu...
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(from the article `cell`) ...of them, called H2A, H2B, H3, and H4, contribute two molecules each to form an octamer, an eight-part core around which two turns of DNA are ... ...exists in the form of chromatin, which is made up of DNA bound to histones (simple alkaline proteins) and other nonhistone proteins. Most of the ... [2 relate...
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http://www.britannica.com/eb/a-z/n/61
<cell biology> Repeating units of organisation of chromatin fibres in chromosomes, consisting of around 200 base pairs and two molecules each of the histones H2A, H2B, H3 and H4. most of the DNA (around 140 base pairs) is believed to be wound around a core formed by the histones, the remainder joins adjacent nucleosomes, thus forming a struct...
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(noo´kle-o-sōm) the primary structural unit of eukaryotic chromatin, seen with the electron microscope as one of the characteristic “beads on a string”; it is composed of a segment of DNA wrapped twice around a core of histones, and is connected to each adjacent nucleosome by a short DNA segment.
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Repeating units of organization of chromatin fibres in chromosomes, consisting of around 200 base pairs, and two molecules each of the histones H2A, H2B, H3 and H4. Most of the DNA (around 140 base pairs) is believed to be wound around a core formed by the histones, the remainder joins adjacent nucleosomes, thus forming a structure reminiscent of a string of beads.
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a compact, highly folded unit of a eucaryotic chromosome which contains about 200 base pairs.
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Type: Term Pronunciation: nū′klē-ō-sōm′ Definitions: 1. A localized aggregation of histone and DNA that is evident when chromatin is in the uncondensed stage. Synonyms: nu body
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Nucleosome: Structure responsible in part for the compactness of a chromosome. Each nucleosome consists of a sequence of DNA wrapped around a core of histone (a type of protein).
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any of the repeating subunits of chromatin occurring at intervals along a strand of DNA, consisting of DNA coiled around histone.
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