First purine nucleotide, which is synthesized in purine biosynthesis ? IMP

First purine nucleotide, which is
synthesized in purine biosynthesis ?
a) AMP
b) GMP
c) IMP
d) UMP
Correct Answer - C
The biosynthesis of purine begins with ribose-5-phosphate, derived
from pentose phosphate pathway (PPP).
First intermediate formed in this pathway, 5-phosphoribosyl-
pyrophosphate (PRPP), is also an intermediate in purine salvage
pathway