Which pyrimidine base is only found in RNA?

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Multiple Choice

Which pyrimidine base is only found in RNA?

Explanation:
Bases come in two groups: purines (adenine and guanine) and pyrimidines (cytosine, thymine, and uracil). In RNA, thymine isn’t used; uracil takes its place and pairs with adenine during RNA processes. That makes uracil the pyrimidine base found only in RNA. Cytosine is a pyrimidine that appears in both RNA and DNA, and the purines adenine and guanine appear in both types of nucleic acids, pairing with uracil in RNA or thymine in DNA.

Bases come in two groups: purines (adenine and guanine) and pyrimidines (cytosine, thymine, and uracil). In RNA, thymine isn’t used; uracil takes its place and pairs with adenine during RNA processes. That makes uracil the pyrimidine base found only in RNA. Cytosine is a pyrimidine that appears in both RNA and DNA, and the purines adenine and guanine appear in both types of nucleic acids, pairing with uracil in RNA or thymine in DNA.

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