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Question

What is the length of the one complete spiral DNA?

A
10 oA
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B
20 oA
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C
32 oA
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D
34 oA.
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Solution

The correct option is A 34 oA.
An answer is an option (D).
The length of one complete turn spiral is 3.4 nm (34 Å ). One turn is the distance between two successive major grooves or minor grooves. 3. In one complete turn of DNA, 10 base pairs are present.

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