Two purines found in DNA are ___.

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Multiple Choice

Two purines found in DNA are ___.

Purines are the two-ring nucleobases. In DNA, the two purines are adenine and guanine. The other bases, cytosine and thymine, are pyrimidines (single-ring) in DNA, with uracil taking thymine’s place in RNA. So the only pair that comprises both members of the purine group is adenine and guanine. The mix-and-match options that include thymine, cytosine, or uracil don’t fit because those bases are pyrimidines, not purines.

Purines are the two-ring nucleobases. In DNA, the two purines are adenine and guanine. The other bases, cytosine and thymine, are pyrimidines (single-ring) in DNA, with uracil taking thymine’s place in RNA. So the only pair that comprises both members of the purine group is adenine and guanine. The mix-and-match options that include thymine, cytosine, or uracil don’t fit because those bases are pyrimidines, not purines.

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