Cytosine pairs with which base?

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Multiple Choice

Cytosine pairs with which base?

Explanation:
Base pairing follows complementary rules: cytosine forms three hydrogen bonds with guanine, a purine–pyrimidine pairing that helps maintain the uniform width of the DNA double helix. That specific pairing is what makes cytosine pair with guanine. In DNA, adenine pairs with thymine (two hydrogen bonds), and in RNA, adenine pairs with uracil. So cytosine pairs with guanine, not with adenine, thymine, or uracil.

Base pairing follows complementary rules: cytosine forms three hydrogen bonds with guanine, a purine–pyrimidine pairing that helps maintain the uniform width of the DNA double helix. That specific pairing is what makes cytosine pair with guanine. In DNA, adenine pairs with thymine (two hydrogen bonds), and in RNA, adenine pairs with uracil. So cytosine pairs with guanine, not with adenine, thymine, or uracil.

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