What is an important difference between the biosynthesis of purine nucleotides and pyrimidine nucleotides?

a. the growing pyrimidine ring is bonded to ribose while the ribose is added later to the purine ring.
b. purine nucleotides require n10- in their biosynthetic pathways.
c. the growing purine ring is bonded to ribose while the ribose is added later to the pyrimidine ring.
d. proline is the precursor for purine biosynthesis while it is not for pyrimidine biosynthesis.

The correct answer is option C.

Explanation:

The biosynthesis of the pyrimidines are the simple than the biosynthesis of the purines nucleotide as pyrimidines are synthesized rings first and added later to the ribose sugar.

The synthesis of the bases of the purines are synthesizes the ribose sugar is bind first and latter it is added to the purine ring which is ribose - 5- phosphate.

Thus, the correct answer is option C.

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