The diameter of DNA molecule is

10 ˚ A

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100 ˚ A

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200 ˚ A

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20 ˚ A

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Solution

The correct option is D $20 ˚ A$
DNA is made of two ("duplex DNA") dextrogyre (like a screw, right- handed) helical chains or strands ("the double helix"), coiled around an axis to form a double helix of $20 ˚ A$ of diameter. The two strands are antiparallel. The general appearance of the polymer shows a periodicity of $3.4 ˚ A$ , corresponding to the distance between 2 bases, and another one of $34 ˚ A$ , corresponding to one helix turn.
So, the correct answer is " $20 ˚ A$ ".

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