Multiple choice

Which of the following amino acids constitutes a component of urea cycle?

  1. Tryptophan

  2. Phenylalanine

  3. Arginine

  4. Leusine
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C Correct answer
Explanation

Arginine is directly involved in the urea cycle as an intermediate; it's hydrolyzed by arginase to produce urea and regenerate ornithine. Tryptophan and phenylalanine are aromatic amino acids unrelated to nitrogen excretion. Leusine is also not part of the urea cycle.

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