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प्रश्न
Explain the formation of a nucleosome.
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उत्तर
Komberg proposed a model for the nucleosome, in which 2 molecules of the four histone proteins H2A, H2B, H3, and H4 are organized to form a unit of eight molecules called histone octamere.
The negatively charged DNA is wrapped around the positively charged histone octamere to form a structure called a nucleosome. A typical nucleosome contains 200 bp of DNA helix. The histone octameres are in close contact and DNA is coiled on the outside of the nucleosome.
Nucleosome
संबंधित प्रश्न
The number of adenine molecules in a given DNA segment is 25 and the number of cytosine molecules is 45, the total number of nucleotides in the segment is _______________.
Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.
The length of DNA segment having 44 base pairs is ______
Nucleosome core is made of ______.
Find out the wrong statement about heterochromatin.
Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?
What would happen if histones were to be mutated and made rich in acidic amino acids such as aspartic acid and glutamic acid in place of basic amino acids such as lysine and arginine?
Which of the following amino acid residues will constitute the histone core?
Histones are enriched with ______.
Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.
Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome.
In the light of the above statements, choose the correct answer from the options given below:
