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chromatin

chromatin The substance of which eukaryotic chromosomes are composed. It consists of proteins (principally histones), DNA, and small amounts of RNA. The DNA molecule is wrapped around the histones to form a series of linked globular nucleosomes, resembling beads on a string. This is itself coiled to form a highly condensed solenoid arrangement, constituting a form of chromatin called heterochromatin, which stains densely with basic stains. The genes in the solenoid can only be transcribed if the solenoid unfolds to some extent, forming an expanded chromatin (euchromatin), which is lighter staining. The degree of condensation in any particular region is regulated by reversible acetylation of the histones: the greater the degree of acetylation, the less condensed the chromatin, and hence the greater the availability of genes for transcription.

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"chromatin." A Dictionary of Biology. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

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chromatin

chromatin The substance of chromosomes, which includes DNA, chromosomal proteins, and chromosomal RNA. Chromatin stains strongly with basic dyes. It is thought that the chromatin is most deeply stained when it is most condensed and inactive.

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"chromatin." A Dictionary of Plant Sciences. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

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"chromatin." A Dictionary of Plant Sciences. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chromatin

chromatin

chro·ma·tin / ˈkrōmətən/ • n. Biol. the material of which the chromosomes of organisms other than bacteria (i.e., eukaryotes) are composed. It consists of protein, RNA, and DNA.

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"chromatin." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

"chromatin." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/chromatin

"chromatin." The Oxford Pocket Dictionary of Current English. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/chromatin

chromatin

chromatin (kroh-mă-tin) n. the material of a cell nucleus that stains with basic dyes and consists of DNA and protein: the substance of which the chromosomes are made.

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"chromatin." A Dictionary of Nursing. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

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"chromatin." A Dictionary of Nursing. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/chromatin

chromatin

chromatin The substance of chromosomes, which includes DNA, chromosomal proteins, and chromosomal RNA. Chromatin stains strongly with basic dyes.

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"chromatin." A Dictionary of Zoology. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

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chromatin

chromatin: see chromosome.

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"chromatin." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

"chromatin." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/chromatin

"chromatin." The Columbia Encyclopedia, 6th ed.. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/chromatin