How many hydrogen bonds are there between A and T in DNA?

Options

Correct answer

C. 2

Step-by-step solution

There are two hydrogen bonds between A and T in DNA and 3 between G and C. One full turn of the helical strand in DNA involves ten base pairs or ten steps of ascent. Each step of ascent measures 3.4Å. Hence, the pitch of B-DNA is 34Å. The rise per base pair in B-DNA is 3.4Å.

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