Which one of the following pairs of amino acids is NOT incorporated in a polypeptide chain?

Which one of the following pairs of amino acids is NOT incorporated in a polypeptide chain?

(A) 4-Hydroxyproline and γ-carboxyglutamate
(B) γ-Carboxyglutamate and desmosine
(C) Ornithine and citrulline
(D) 4-Hydroxyproline and 5-hydroxylysine

SouravAugust 18, 2024

Answer

Answer: (C) Ornithine and citrulline

Explanation:
Ornithine and citrulline are not standard amino acids incorporated into proteins during translation. They are intermediates in the urea cycle, whereas the other options include modified amino acids (like 4-Hydroxyproline and γ-carboxyglutamate) that can be incorporated into polypeptide chains in specific contexts.

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