Question

question 8
how are peptide bonds formed between amino acids in the elongation process of the translation of mrna?
the amine group of one amino acid reacts with amine group of another amino acid.
the carboxyl group of one amino acid reacts with amino group of the same amino acid.
the amine group of one amino acid reacts with carboxyl group of another amino acid.
the carboxyl group of one amino acid reacts with carboxyl group of another amino acid.

Explanation:

A peptide bond is a covalent bond formed between two amino acids. In the elongation process of mRNA translation, the amine group ($-NH_2$) of one amino acid reacts with the carboxyl group ($-COOH$) of another amino acid. This reaction results in the formation of a peptide bond ($-CO - NH-$) and the release of a water molecule ($H_2O$). The other options are incorrect because:

• Option A: Reacting two amine groups does not form a peptide bond.
• Option B: Reacting a carboxyl group with an amino group of the same amino acid is not how peptide bonds are formed in the context of protein synthesis during translation elongation (peptide bonds are between different amino acids in the growing polypeptide chain).
• Option D: Reacting two carboxyl groups does not form a peptide bond.

Answer:

C. The amine group of one amino acid reacts with carboxyl group of another amino acid.