NEET 2000 Biology question

Length of one loop of B- DNA :

(1)3.4 nm.Correct
(2)0.34 nm.
(3)20 nm.
(4)10 nm.

Answer: (1)

Solution

In the Watson-Crick (B-form) double helix the two strands are right-handed and antiparallel; the distance between two successive base pairs is 0.34 nm and one complete turn (loop/pitch) contains 10 base pairs, so the length of one turn is $10 × 0.34\

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Question ID VK-088700