Non-protein amino acid is: (A) Aspaate, (B) Histidine, (C) Ornithine, (D) Tyrosine
Answer is C. Non-protein amino acids are those found in our body but not incorporated into proteins. They are not coded by codons. Example of non-protein amino acids: Ornithine Citrulline Homocysteine Beta-alanine GABA Sarcosine Homoserine