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a
single copy each of H2A, H2B, H3, H1
b
two copies each of H2A, H2B, H3, H4
c
single copy of each of H2A, H2B, H3, H4
d
two copies each of H1, H2A, H3, H4
answer is B.
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Detailed Solution
There are five types of histone proteins H1, H2A, H2B, H3 and H4. Four of them occur in pairs to produce histone octamer (2 copies of each – H2A, H2B, H3 and H4), called nu-body or core of nucleosome.