Final answer:
In step 1 of elongation, the second aminoacyl-tRNA binds to the A site on the ribosome.
Step-by-step explanation:
In the first step of elongation, the second aminoacyl-tRNA binds to the A site on the ribosome. The codon on the mRNA interacts with the anticodon of the aminoacyl-tRNA, allowing it to enter the ribosome and bind to the A site. After binding, the codon on the mRNA will be ready for the formation of a peptide bond with the amino acid attached to the tRNA in the A site.