Which of these is a direct fuel for the urea cycle?
B) glutamate
C) carbamoyl phosphate
D) pyruvate

Question

Which of these is a direct fuel for the urea cycle?
B) glutamate 
C) carbamoyl phosphate 
D) pyruvate

Quizplus · Accepted Answer

Carbamoyl phosphate is a direct fuel for the urea cycle. It is formed from the reaction between ammonia and bicarbonate, catalyzed by the enzyme carbamoyl phosphate synthetase I (CPSI). The other options, including glutamate and pyruvate, can be used to indirectly provide nitrogen and carbon skeletons for the urea cycle, but they are not direct fuels for the cycle itself.

Which of These Is a Direct Fuel for the Urea