alleryStart learning →Which pair of nitrogen bases are substituted purines?
AAdenine and guanine
BCytosine and thymine
CUracil and cytosine
DThymine and uracil
Answer & Solution
Correct answer: A. Adenine and guanine
Adenine and guanine are purines, while cytosine, thymine and uracil are pyrimidines.
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