Which of the following supplies a nitrogen atom to carbamoyl phosphate in the urea cycle?

Question

Quizplus · Accepted Answer

Aspartate supplies a nitrogen atom to carbamoyl phosphate in the urea cycle. This occurs in the second step of the cycle, where carbamoyl phosphate reacts with ornithine to form citrulline, with aspartate providing the nitrogen atom for the carbamoyl group. Therefore, option A is the best choice. Option B, alpha-ketoglutarate, is involved in the citric acid cycle, not the urea cycle. Option C, lysine, does not provide nitrogen to carbamoyl phosphate, and option D, ornithine, reacts with carbamoyl phosphate but does not supply the nitrogen atom.

Which of the Following Supplies a Nitrogen Atom to Carbamoyl