Cytosine is which of the following?

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Multiple Choice

Cytosine is which of the following?

Explanation:
Cytosine is a single-ring nitrogenous base, a pyrimidine. Purines (like adenine and guanine) have two rings, while pyrimidines have one. In DNA and RNA, cytosine pairs with guanine through hydrogen bonding, so it functions as the base that pairs with guanine. It’s not a sugar or a phosphate group, which are part of the backbone. That’s why the description “a single-ring nitrogenous base that pairs with guanine” best fits cytosine.

Cytosine is a single-ring nitrogenous base, a pyrimidine. Purines (like adenine and guanine) have two rings, while pyrimidines have one. In DNA and RNA, cytosine pairs with guanine through hydrogen bonding, so it functions as the base that pairs with guanine. It’s not a sugar or a phosphate group, which are part of the backbone. That’s why the description “a single-ring nitrogenous base that pairs with guanine” best fits cytosine.

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