Essential Biochemistry - Protein Metabolism (Section 3 - No. 46)
What is the first step in the urea cycle?
Formation of citrulline.
Formation of carbamoyl phosphate.
Hydrolysis of arginine.
Transamination of glutamate.
Explanation
The first step is the formation of carbamoyl phosphate from ammonia, CO2, and ATP, catalyzed by carbamoyl phosphate synthetase I.
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