Multiple choice

Which of following amino acids are non protein amino acids?

  1. Homoserine

  2. Homocysteine

  3. Ornithine

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Homoserine, homocysteine, and ornithine are all non-protein amino acids, meaning they are not incorporated into proteins during translation but serve metabolic functions. Homoserine is a methionine biosynthesis intermediate, homocysteine is involved in methionine cycle, and ornithine participates in urea cycle.

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