During elongation of translation, what happens most directly following a charged tRNA binding to the A site?
a. the ribosome moves along the mRNA.
b. a peptide bond is formed and the peptide is released from the tRNA in the P site.
c. the empty tRNA exits from the E site.
d. a bond is formed between the amino acid on the tRNA in the A site and the amino acid that is farthest from the ribosome.