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Length of one turn of DNA helix is 34Å. 1Å = 10⁻¹⁰ nm.

1. One turn of DNA helix is 20Å.
2. One turn of DNA helix is 34Å.
3. One turn of DNA helix is 10Å.
4. One turn of DNA helix is 50Å.

Correct answer: One turn of DNA helix is 34Å.

Solution

The problem already states that one turn of the DNA helix is 34 Å, so the correct choice is the option that repeats this value. The unit-conversion note is irrelevant unless you need to convert units, which you do not here.

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