Which Event Occurs During the Elongation Stage

Question

Which event occurs during the elongation stage?  
A) tRNA transfers mRNA to the ribosomes.
B) Free amino acids bind to the mRNA binding site.
C) Anticodons bind to complementary codons.
D) A stop codon enters the ribosome.
E) rRNA catalyzes the formation of peptide bonds.

Accepted Answer

During the elongation stage of translation, rRNA within the ribosome catalyzes the formation of peptide bonds between the amino acids brought in by the tRNAs. Anticodons on the tRNAs bind to the complementary codons on the mRNA, allowing the correct amino acid to be added to the growing polypeptide chain. This process continues until a stop codon is reached. Therefore, the correct answer is (E) rRNA catalyzes the formation of peptide bonds.