Biologymedium · Past Paper
Which nitrogenous bases are purines?
AAdenine and Cytosine
BGuanine and Thymine
CAdenine and Guanine
DCytosine and Thymine
✓ Correct Answer: C — Adenine and Guanine
Purines are double-ring nitrogenous bases consisting of Adenine and Guanine.
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