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Question

If DNA has 45,000 base pairs, how many complete turns will the DNA molecule take?

A
4500
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B
450
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C
45000
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D
45
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Solution

The correct option is A 4500
DNA is made up of two polynucleotide chains which are coiled in a right-handed fashion.

The pitch of the helix is 3.4 nm and there are approximately 10 base pairs in each turn.

Since, 10 base pairs = 1 complete turn,

45,000 base pairs = 45,000/10 = 4500 complete turns.

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