Q.

Histones are rich in

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a

cysteine and tyrosine

b

lysine and serine

c

lysine and arginine

d

alanine and glycine 

answer is B.

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Detailed Solution

Histones are rich in basic amino acids, particularly lysine and arginine. The abundance of lysine and arginine residues contributes to the positively charged nature of histone proteins, which allows them to interact with the negatively charged phosphate groups of DNA.

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