Pyrimidines in DNA are:

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Study for the Campbell Biology Concepts and Connections Test. Explore flashcards and multiple-choice questions, complete with hints and explanations. Prepare for your success!

Multiple Choice

Pyrimidines in DNA are:

Explanation:
Pyrimidines are one-ring nitrogenous bases. In DNA, the bases that have this single-ring structure are cytosine and thymine. The other bases, adenine and guanine, are purines with two rings. This distinction explains the pairing pattern you learn in DNA—cytosine pairs with guanine, and thymine pairs with adenine—through specific hydrogen bonds. It’s also useful to remember that thymine is unique to DNA, while RNA uses uracil instead of thymine.

Pyrimidines are one-ring nitrogenous bases. In DNA, the bases that have this single-ring structure are cytosine and thymine. The other bases, adenine and guanine, are purines with two rings. This distinction explains the pairing pattern you learn in DNA—cytosine pairs with guanine, and thymine pairs with adenine—through specific hydrogen bonds. It’s also useful to remember that thymine is unique to DNA, while RNA uses uracil instead of thymine.

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