Pyrimidines nitrogenous bases?

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Multiple Choice

Pyrimidines nitrogenous bases?

Explanation:
Pyrimidines are the nitrogenous bases with a single ring. The bases that fit this 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 (thymine is replaced by uracil in RNA). So the set containing exactly cytosine, uracil, and thymine is the correct one. The other options mix purines (adenine and guanine, which have two rings) with pyrimidines, or include adenine, which is not a pyrimidine.

Pyrimidines are the nitrogenous bases with a single ring. The bases that fit this 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 (thymine is replaced by uracil in RNA).

So the set containing exactly cytosine, uracil, and thymine is the correct one. The other options mix purines (adenine and guanine, which have two rings) with pyrimidines, or include adenine, which is not a pyrimidine.

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