Pyrimidines in DNA are:

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Test your knowledge with the Campbell Biology Concepts and Connections Quiz. Study with flashcards and multiple choice questions, each question has hints and explanations. Prepare effectively for your biology concepts exam!

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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