Why DNA double helix have a uniform diameter?

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“C” nucleotides pair with “A” nucleotides

Deoxyribose sugars bind with ribose sugars

Nucleotides bind with nucleosides

Purines pair with pyrimidines

answer is A.

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Detailed Solution

NCERT Page No.81.

The bases in two strands are paired through hydrogen bond (H-bonds) forming base pairs (bp).

Adenine forms two hydrogen bonds with Thymine from opposite strand and vice-versa.

Similarly, Guanine is bonded with Cytosine with three H-bonds. As a result, always a purine comes opposite to a pyrimidine.

This generates approximately uniform distance between the two strands of the helix

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