Which nitrogen bases are purines?

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Multiple Choice

Which nitrogen bases are purines?

Explanation:
Purines are nitrogenous bases that have two rings in their structure. The bases that fit this category are adenine and guanine. The other bases—cytosine, thymine, and uracil—have only one ring, making them pyrimidines. In DNA, thymine pairs with adenine, and in RNA, uracil pairs with adenine, while guanine pairs with cytosine. So the bases that are purines are adenine and guanine.

Purines are nitrogenous bases that have two rings in their structure. The bases that fit this category are adenine and guanine. The other bases—cytosine, thymine, and uracil—have only one ring, making them pyrimidines. In DNA, thymine pairs with adenine, and in RNA, uracil pairs with adenine, while guanine pairs with cytosine. So the bases that are purines are adenine and guanine.

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