Pyrimidine biosynthesis is allosterically inhibited by ATP. a. requires an intermediate found in urea biosynthesis. b. does not require ATP hydrolysis. c. involves synthesizing the base while it is attached to ribose.

requires an intermediate found in urea biosynthesis

Explanation:

Both pyrimidine and urea are carbon and nitrogen containing compounds. Carbamoyl phosphate provides both carbon and nitrogen in biosynthesis pathways of both pyrimidine and urea. Hence, it is an intermediate in both the pathways.

In urea biosynthesis carbamoyl phosphate provides its carbamoyl group to ornithine. In pyrimidine synthesis it donates the carbamoyl group to aspartate. Carbamoyl phosphate synthetase synthesizes carbamoyl phosphate by joining ammonium ions to carbon dioxide and adenosine triphosphate.

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