Which bases are purines?

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Study for the PLTW Biomedical Science EOC Test. Engage with flashcards and multiple-choice questions, each with detailed explanations. Excel in your exam!

Multiple Choice

Which bases are purines?

Explanation:
Purines are a category of nitrogenous bases with two-ring structures. In DNA and RNA, the bases fall into purines and pyrimidines. The purines are adenine and guanine, each featuring a double-ring system. The other bases—thymine and cytosine in DNA (and uracil replacing thymine in RNA)—are pyrimidines and have a single ring. The two purines pair with the pyrimidines through hydrogen bonds: adenine pairs with thymine (or uracil in RNA), and guanine pairs with cytosine. So the bases that are purines are adenine and guanine.

Purines are a category of nitrogenous bases with two-ring structures. In DNA and RNA, the bases fall into purines and pyrimidines. The purines are adenine and guanine, each featuring a double-ring system. The other bases—thymine and cytosine in DNA (and uracil replacing thymine in RNA)—are pyrimidines and have a single ring. The two purines pair with the pyrimidines through hydrogen bonds: adenine pairs with thymine (or uracil in RNA), and guanine pairs with cytosine. So the bases that are purines are adenine and guanine.

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