Q. Select the correct pair of substituted purines
A) Cytosine and thymine
B) Adenine and guanine
C) Uracil and cytosine
D) Guanine and uracil
Explanation
Adenine and guanine are substituted purines, while the rest (uracil, cytosine and thymine) are substituted pyrimidines
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.