Key enzyme in urea synthesis is____________?
Correct answer: A. Carbamyl synthetase
- A. Carbamyl synthetase
- B. Urease
- C. Arginase
- D. Ornithine
Explanation
Carbamoyl phosphate synthetase I catalyses the first, committed step of the urea cycle in liver mitochondria, forming carbamoyl phosphate from ammonia. Urease breaks down urea, while ornithine is a cycle substrate rather than an enzyme.
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