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Which is wrong about nucleic acids?

1. DNA is single stranded in some viruses
2. RNA is double stranded occasionally
3. Length of one helix is 45Å in B-DNA
4. One turn of Z-DNA has 12 bases

Correct answer: Length of one helix is 45Å in B-DNA

Solution

B-DNA has a helical pitch of about 34 Å per turn, not 45 Å. The other statements are acceptable: some viruses have single-stranded DNA, RNA can be double-stranded in some cases, and Z-DNA has 12 bases per turn.

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