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

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

  1. A

    20nm and 2 nm respectively

  2. B

    2 nm and 20 nm respectively

  3. C

    0.34 nm and 3.4 nm respectively

  4. D

    3.4 nm and 0.34 nm respectively

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    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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