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Q.

The pitch of the DNA helix and the distance between adjacent base pairs in a helix is approximately

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a

20nm and 2 nm respectively

b

2 nm and 20 nm respectively

c

0.34 nm and 3.4 nm respectively

d

3.4 nm and 0.34 nm respectively

answer is D.

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Detailed Solution

The two chains are coiled in a right-handed fashion. The pitch of the helix is 3.4 nm and there are roughly 10 bp in each turn. Consequently, the distance between adjacent base pairs in a helix is approximately 0.34 nm.

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