22. How many nitrogen base pairs are present in a complete
rotation (twist) of B-DNA:
(A) 5 (B) 10 (C) 15 (D) 20
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Explanation:
10 base pairs
B-DNA nitrogenous bases are almost perpendicular to the helical axis, and each base pair is twisted 36 degrees relative to the adjacent bases. Each complete turn of the helix encompasses 3.4 nm or 10 base pairs (9.7 and 10.6 in different crystals) (2).
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Answer:
B) 10...
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