nucleosome In some cells, DNA combines with proteins to form a substance called
ID: 48553 • Letter: N
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nucleosome In some cells, DNA combines with proteins to form a substance called methylation The lowest level of chromatin structure consists of DNA wrapped twice around a group of animal histones to form a(n) promoter The formation of nucleosomes may block the binding of transcription factors and RNA polymerase II to the gene RNA The structure of chromatin can be modified by altering either the DNA or the attached to DNA. phosphorylation euchromatin Large chromatin-remodeling complexes alter the structure of chromatin in order to make the DNA accessible to regulatory proteins which, in turn, affect gene expression histones eukaryotic In vertebrates, methylation of ensures that once a gene is turned off, it stays off. less The of histones is correlated with tighter coiling of the DNA and inactive regions more of chromatin. DNA The of histones tends to loosen the coiling of DNA, making it more accessible for Chromosome transcription prokaryotic Chromatin is present in eukaryotic cells only acetylation heterochromatin Chromatin that contains highly condensed DNA which is not being expressed is called operator chromatin Chromatin that contains loosely coiled DNA, which is accessible for transcription, is called operon Tighter coiling of the chromatin makes the DNA accessible for transcription ResetExplanation / Answer
1. In some cells DNA combine with protein to form a substance called chromatin.
In Eukaryotic cells , DNA winds around histone proteins to form chromatin.
2. The lowest level of chromatin structure consists of DNA wrapped twise around a group of histones to form a nucleosome.
3. The formation of nucleosomes may block the binding of transcription factors and RNA polymerase II to the DNA.
4. The structure of chromatin can be modified by either altering the DNA or the -----histones------- attached to DNA.
Both DNA methylation and histone modification alter chromatin structure.
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