Question

Purine derivative among the following bases is [KCET (Med./Engg.) 2002; MPPET 2004]
A) Guanine B) Cytosine C) Thymine D) Uracil

Answer 1

Generally there are two nucleobase purines.They are 
            ADENINE AND GUANINE 
 so the ans is (A) Guanine