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In eukaryotes, the histone octamer around which DNA is wrapped to form a nucleosome consists of:
A16 histone molecules
B8 histone molecules (2 each of H2A, H2B, H3, H4)
C2 each of H1, H2A, H2B, H3
D4 histone molecules
Answer & Solution
Correct answer: B. 8 histone molecules (2 each of H2A, H2B, H3, H4)
**Histone octamer = 8 histones (2 copies each of H2A, H2B, H3, H4)**. DNA wraps ~1.65 turns (200 bp) around this octamer to form a **nucleosome**. (H1 is a linker histone, sits outside.)
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