The steps required for peptide elongation at the ribosome are,respectively,
A)initiation,elongation and termination.
B)decoding,transpeptidation,and translocation.
C)initiation,elongation,and release.
D)aa-tRNA binding,GTP-peptidation,and translocation.
E)none of the above

Question

Quizplus · Accepted Answer

Peptide elongation at the ribosome involves three main steps: decoding, transpeptidation, and translocation. During decoding, the mRNA sequence is read and matched with the appropriate aminoacyl-tRNA. The amino acid is transferred to the growing polypeptide chain in the process of transpeptidation. After peptide bond formation, the ribosome moves one codon along the mRNA in the process of translocation, allowing a new aminoacyl-tRNA to enter the A-site and the uncharged tRNA to exit the ribosome. These steps are repeated until a stop codon is encountered, leading to release of the completed polypeptide chain. Therefore, option B is the correct answer.

The Steps Required for Peptide Elongation at the Ribosome Are,respectively