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Structure of DNA

Identify the ...

Question

Identify the pair of nucleotides which is joined by three hydrogen bonds in double-stranded DNA

A

AG

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B

AT

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C

TG

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D

CG

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Solution

The correct option is D CG
A purine base pairs with pyrimidine and pyrimidine with purine. A purine never pairs with other purine base; hence adenine never pairs with guanine. Further, adenine pairs with thymine only not with cytosine and guanine pairs with cytosine. Three hydrogen bonds can form between G and C, but only two can form between A and T. Correct answer is D.

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