Biochemistry : Protein Catabolism Regulation

Study concepts, example questions & explanations for Biochemistry

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Example Questions

Example Question #1 : Protein Catabolism Regulation

Which enzyme catalyzes the rate-limiting step of the urea cycle? 

Possible Answers:

Carbamoyl phosphate dehydrogenase

Ornithine transcarbamylase

Argininosuccinate lyase

Carbamoyl phosphate synthetase

Correct answer:

Carbamoyl phosphate synthetase


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.

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