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Q.

What are the repeating units of chromatin?

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a

Chromomeres

b

Plasmasomes

c

Nucleosome

d

Nucleoli

answer is C.

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Detailed Solution

Histones are organised to form a unit of eight molecules called histone octamer. The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome. A typical nucleosome contains 200 bp of DNA helix. Nucleosomes constitute the repeating unit of a structure in nucleus called chromatin, threadlike stained (coloured) bodies seen in nucleus.

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