A double-stranded DNA molecule with 6390 base pairs long will have the following number of turns:

639

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63.9

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6.39

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31.95

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Solution

The correct option is A 639
In double stranded DNA molecule, the two chains are coiled in a right-handed fashion. There are 10 bp in each turn. The given DNA length is 6390 base pairs and 1 is turn made up of 10 base pairs. So, the required number of turn = 6390 ÷ 10 = 639.

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