Which of the Following are Nitrogenous Bases of the Purine

Question

Which of the following are nitrogenous bases of the purine type?
A) cytosine and guanine
B) guanine and adenine
C) adenine and thymine
D) thymine and uracil
E) uracil and cytosine

Accepted Answer

Purines are nitrogenous bases with a double-ring structure, and the two purines are adenine and guanine. Therefore, the best choice is B, which includes guanine and adenine.