Question

Identify the base that has a two-ring structure.

adenine
cytosine
thymine
uracil

Answer 1

A) adenine

Step-by-step explanation:

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Answer 2

The purines in DNA are adenine and guanine, the same as in RNA. The pyrimidines in DNA are cytosine and thymine; in RNA, they are cytosine and uracil. Purines are larger than pyrimidines because they have a two-ring structure while pyrimidines only have a single ring

Step-by-step explanation: