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which one is not a standard amino acid but is found in the urea cycle? Please...

which one is not a standard amino acid but is found in the urea cycle? Please explain.

malate

oxaloacetate

arginine

ornithine
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Answer #1

Ornithine is not a standard amino acid, but is an integral part of the urea cycle. Ornithine is produced as one of the products of the action of arginase enzyme of L-arginine to create urea. Ornithine aids in the removal of excess nitrogen from the body and is recycled by the urea cycle, thereby acting as a catalyst. However, ornithine is not coded by DNA and hence, is not a standard amino acid. The structure of ornithine is shown below.

Structure of ornithine (taken from internet sources)

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