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Q.

Choose the correct statement about DNA packaging from the following.

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a

The beads-on-string structure in chromatin is packaged to form chromatin fibers that are further coiled and condensed during metaphase.

b

In a typical nucleus, the region of chromatin which stains light is referred to as heterochromatin

c

A typical nucleosome contains 300 bp of DNA helix.

d

Histones are rich in the basic amino acid residues glycine and arginine, both of which carry a positive charge.

answer is A.

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Detailed Solution

Chromatin with nucleosomes is further packed to organise into chromosomes during metaphase. Histone proteins have more arginine and lysine amino acids. Nucleosome has a length of DNA with 200bp. Lightly stained region of chromatin is called euchromatin. 

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