The purines include _____ and _____.

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Multiple Choice

The purines include _____ and _____.

Explanation:
Purines are the two-ring nitrogenous bases in nucleic acids. The bases that belong to this group are adenine and guanine, both with two rings. The other bases listed—cytosine and thymine (and uracil in RNA)—are pyrimidines, which have a single ring. So adenine and guanine together are the purines, while the others are not.

Purines are the two-ring nitrogenous bases in nucleic acids. The bases that belong to this group are adenine and guanine, both with two rings. The other bases listed—cytosine and thymine (and uracil in RNA)—are pyrimidines, which have a single ring. So adenine and guanine together are the purines, while the others are not.

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