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Nucleosome

The structura...

Question

The structural unit formed by tight coiling of DNA around the histone octamer is called the ________________.

A

Nucleosome

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B

Nuclein

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C

Nucleolus

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D

Nucleoid

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Solution

The correct option is A
Nucleosome

DNA is tightly wrapped around the histone octamer to form a structure known as the nucleosome. It is this compact packaging that ultimately helps the 2.2m long DNA molecule fit itself inside the tiny nucleus of a cell.

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Q. The structural unit formed by tight coiling of DNA around the histone octamer is called the .

The structural unit formed by tight coiling of DNA around the histone octamer is called the ________________.

Q. In tertiary structure of DNA, what is a histone octamer?

Q. Assertion :DNA is associated with proteins. Reason: DNA binds around histone proteins that form a pool and the entire structure is called as a nucleosome.

Q. Go through the following statements
(i) A typical nucleosome contains 400 bp of DNA helix.
(ii) The positively charged DNA is wrapped around the negatively charged histone octamer to form a structure called nucleosome.
(iii) Histones are rich in the basic amino acid residues asparagine and valine
(iv) The packing of chromatin at higher level requires additional set of proteins that collectively are referred to as Non-histone chromosomal proteins.

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