Which purine & pyrimidine bases are paired together by H bonds in DNA?

AC and GT

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GC and AT

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GA and TC

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None of the above

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Solution

The correct option is B GC and AT
Purines and pyrimidines, make up the two groups of nitrogenous base which plays on important role in structural backbone of DNA. Adenine and guanine are purines, while cytosine and thymine are pyrimidines. Purines pairs with pyrimidines, by formation of H-bonds. Adenine attaches to thymine, by two hydrogen bonds, while cytosine and guanine forms three hydrogen between them.

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