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Question

The pitch of the double-stranded B-DNA helix is


A

34 A

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B

3.4 A

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C

3.4 nm

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D

Both A and C

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Solution

The correct option is D

Both A and C


The correct option is D

Explanation of the correct option:

  1. A "double helix" is the name for the structure formed by DNA and other double-stranded nucleic acids.
  2. The most common DNA conformation is thought to be B-DNA, in which the chains twist to the right and up around the front of the helix's axis.
  3. 34 Angstroms is the pitch of the B-DNA strand.
  4. A 34 Angstrom is equal to 3.4 nanometers.

Final answer: The pitch of the double-stranded B-DNA helix is 34 Angstrom or 3.4 nm.


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