Question

During chain elongation, peptide bond is formed between a carboxylic group of 1${}^{st}$ amino acid and an amino group of 2${}^{nd}$ amino acid is catalyzed by

• A. Aminoacyl transferase
• B. Aminoacyl synthetase
• C. Peptidyl transferase
• D. Chloramphenicol

Answer 1

The correct option is C Peptidyl transferase

A. Aminoacyl transferase is the enzyme that act on amino acid group.

B. Aminoacyl synthetase catalyse the activation of amino acids and the process is called aminoacylation of tRNA.

C. Peptidyl transferase is involved in the elongation of polypeptide chain. It forms peptide bond between adjacent amino acids. Peptide bond is formed between carboxylic group of one amino acid and amino group of second amino acid.

D. Chloramphenicol is an antibiotic used for treating bacterial infections.

So, the correct answer is 'Peptidyl transferase'.