The pyrimidines include _____ and _____.

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Multiple Choice

The pyrimidines include _____ and _____.

Explanation:
Pyrimidines are the one-ring nitrogenous bases. The bases that fit here are cytosine, thymine, and uracil. In DNA, thymine and cytosine are the two pyrimidines you most commonly state, while uracil is the RNA counterpart to thymine. So naming cytosine and thymine fits the idea of two pyrimidines associated with DNA. Adenine and guanine, by contrast, are purines with two rings, not pyrimidines.

Pyrimidines are the one-ring nitrogenous bases. The bases that fit here are cytosine, thymine, and uracil. In DNA, thymine and cytosine are the two pyrimidines you most commonly state, while uracil is the RNA counterpart to thymine. So naming cytosine and thymine fits the idea of two pyrimidines associated with DNA. Adenine and guanine, by contrast, are purines with two rings, not pyrimidines.

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