Protein Catabolism Regulation
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1
Which enzyme catalyzes the rate-limiting step of the urea cycle?
Carbamoyl phosphate synthetase
CORRECT
Carbamoyl phosphate dehydrogenase
Argininosuccinate lyase
Ornithine transcarbamylase
Explanation
Carbamoyl phosphate synthetase is the rate-limiting step of the urea cycle. It is the first step of the urea cycle and occurs exclusive in the mitochondria of hepatic and renal cells.