Purines and pyrimidines can often exist in their tautomeric forms, these tautomers are easily converted isomers that differ in which of the following;

M.Sc. Bio-Chemistry (PU-CET P.G) 2019 Panjab University Entrance Exam With Answers

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32.

A: Position of sulfur

B: Position of hydrogen

C: Position of oxygen

D: Position of nitrogen

The answer is: B

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