Purines Include

Question

Purines include
A) cytosine,uracil,and thymine.
B) adenine and cytosine.
C) adenine and thymine.
D) cytosine and thymine.
E) adenine and guanine.

Accepted Answer

Purines are a type of nitrogenous base found in nucleotides, and they include adenine and guanine. Choice A is incorrect because cytosine, uracil, and thymine are all pyrimidines. Choice B is incorrect because adenine is a purine, but cytosine is a pyrimidine. Choice C is incorrect because adenine is a purine, but thymine is a pyrimidine. Choice D is incorrect because cytosine and thymine are both pyrimidines.