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Purines and Pyrimidines
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AP Biology
APB.288 Purines and Pyrimidines
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Four students explain base classification. Which explanation is accurate?
A
Adenine and thymine are purines because they pair in DNA.
B
Thymine and uracil are purines because each can pair with adenine.
C
Cytosine and guanine are pyrimidines because they pair in DNA.
D
Adenine and guanine are purines because they share the purine class; cytosine, thymine, and uracil are pyrimidines.
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