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Which of the following purines (nitrogenous bases with two-ring structure) are common to RNA and DNA?

(a) Adenine, Thymine

(b) Guanine, Thymine

(c) Thymine, Cytosine

(d) Adenine, Guanine

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Best answer

Correct option is (d) Adenine, Guanine

Adenine and Guanine are both purines and are present in both DNA and RNA. They form vital complementary base pairs: adenine with thymine in DNA and adenine with uracil in RNA, and guanine with cytosine in both DNA and RNA.