NEET 2006 Biology question

One turn of the helix in a B-form DNA is approximately-

(1)20 nm
(2)0.34 nm
(3)3.4 nmCorrect
(4)2 nm

Answer: (3)

Solution

In the Watson-Crick B-form DNA the two strands are coiled in a right-handed helix with a pitch of 3.4 nm (34 angstrom) per turn; there are 10 base pairs per turn, and the distance between two successive

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Question ID VK-089704