Which is a purine?

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Multiple Choice

Which is a purine?

Explanation:
Purines and pyrimidines are two families of nitrogenous bases distinguished by ring structure. Purines have a two-ring system, while pyrimidines have a single ring. Adenine is part of the purine family, along with guanine. Cytosine, thymine, and uracil are pyrimidines. So, the base that is a purine is adenine. (In DNA and RNA, purines pair with pyrimidines—A with T in DNA and A with U in RNA; G with C in both.)

Purines and pyrimidines are two families of nitrogenous bases distinguished by ring structure. Purines have a two-ring system, while pyrimidines have a single ring. Adenine is part of the purine family, along with guanine. Cytosine, thymine, and uracil are pyrimidines. So, the base that is a purine is adenine. (In DNA and RNA, purines pair with pyrimidines—A with T in DNA and A with U in RNA; G with C in both.)

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