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Which enzyme catalyzes the first step of the urea cycle?

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Question: Which enzyme catalyzes the first step of the urea cycle?

Options:

  1. Carbamoyl phosphate synthetase
  2. Ornithine transcarbamylase
  3. Arginase
  4. Argininosuccinate synthetase

Correct Answer: Carbamoyl phosphate synthetase

Solution: 

Carbamoyl phosphate synthetase catalyzes the first step of the urea cycle, converting ammonia and bicarbonate to carbamoyl phosphate.

Which enzyme catalyzes the first step of the urea cycle?

Practice Questions

Q1
Which enzyme catalyzes the first step of the urea cycle?
  1. Carbamoyl phosphate synthetase
  2. Ornithine transcarbamylase
  3. Arginase
  4. Argininosuccinate synthetase

Questions & Step-by-Step Solutions

Which enzyme catalyzes the first step of the urea cycle?
  • Step 1: Understand that the urea cycle is a process in the body that helps remove ammonia, which is toxic.
  • Step 2: Identify that the first step of the urea cycle involves an enzyme.
  • Step 3: Learn that the enzyme responsible for this first step is called carbamoyl phosphate synthetase.
  • Step 4: Know that this enzyme takes two substances, ammonia and bicarbonate, and converts them into a new substance called carbamoyl phosphate.
No concepts available.
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