Hydrolysis of which of the following compounds yield urea?: (A) Ornithine, (B) Argininosuccinate, (C) Aspartate, (D) Arginine
Answer is D. Arginine is an amino acid that is deaminated to form ornithine primarily in the liver as part of the urea cycle. Ornithine, argininosuccinate, aspartate and citrulline are generated in the urea cycle but do not provide free ammonia for urea synthesis.