UPSC IMPORTANT QUESTIONS

The nitrogenous base Purine occurring in RNA is

a) Cytosine
b) Uracil
c) Guanine
d) Thymine

Ans-[C] 
Explanation-There are total 5 Nitrogenous bases occurring in DNA and RNA. Two are purines and three are Pyrimidines. Purines are Adenine and Guanine and Pyrimidines are Cytosine, Uracil and Thymine. In DNA we have, Adenine, Thymine, Guanine and Cytosine. In RNA, we have Adenine Uracil Guanine and Cytosine.
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