What is the overall repeat distance of helix?

3.4 nm

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0.34 nm

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34 nm

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None of the above

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Solution

The correct option is A 3.4 nm
Wilkins used X-ray crystallography and showed that two antiparallel polynucleotides chains of DNA are coiled around same axis while bases are present at right angle to the axis. Since, one complete turn of the double helix is 3.4 nm long and each of which has 10 base pairs, the distance between two consecutive base pairs 0.34 nm. Correct answer is A.

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