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B-DNA which is right -handed double heli...

B-DNA which is right -handed double helix contains ______ base pairs per turn of the helix and each tum is _____ long .

A

10, 3.4 Å

B

10, 34 Å

C

11, 20 Å

D

11, 34 Å

Text Solution

Verified by Experts

The correct Answer is:
B
In B-DNA, one turn of the helix has about `10` nucleotides on each strand of DNA. A turn occupies a distance of about `3.4` nm (`34 Å` or `3.4 xx10^(-9)m`) so that adjacent nucleotides or their bases are separated by a space of about `0.34 nm (0.34xx10^(-9)m or 3.4 Å)`.
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