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The correct feature of double-helicalsttucture of DNA as given by Watson and Crick is:

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Right-handed helix, pitch is 3-4 nm

Left-handed helix, pitch is 3.8 nm

Right-handed helix, pitch is 3.8 nm

Left-handed helix, pitch is 3.4 nm

answer is A.

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Detailed Solution

DNA strands are right handed in nature. The DNA strand turn completes 34 A⁰ and has 10 base pairs within 1 turn. Hence the pitch is 3.4 A.

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