Which bases are pyrimidines? (Alternate wording)

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Multiple Choice

Which bases are pyrimidines? (Alternate wording)

Explanation:
Pyrimidines are one-ring nitrogenous bases, unlike purines which have two rings. The bases that fit into the pyrimidine category are cytosine, thymine, and uracil. Cytosine is found in both DNA and RNA, thymine is found in DNA, and uracil is found in RNA. The other two bases, adenine and guanine, are purines with two rings, so they are not pyrimidines. Therefore, the pyrimidines are uracil, thymine, and cytosine.

Pyrimidines are one-ring nitrogenous bases, unlike purines which have two rings. The bases that fit into the pyrimidine category are cytosine, thymine, and uracil. Cytosine is found in both DNA and RNA, thymine is found in DNA, and uracil is found in RNA. The other two bases, adenine and guanine, are purines with two rings, so they are not pyrimidines. Therefore, the pyrimidines are uracil, thymine, and cytosine.

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