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One turn of the DNA helix measures 3.4 nm and contains how many base pairs?

A10
B34
C20
D12
Answer & Solution
Correct answer: A. 10
1. Base pairs are 0.34 nm apart. 2. Ten base pairs fill one turn. 3. The helix is 2 nm wide throughout. _Source: OpenStax Biology 2e, Chapter 14, DNA Structure and Function (CC BY 4.0)._
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