During ribosomal peptide chain elongation, which ribosomal site receives the incoming aminoacyl-tRNA specified by the next mRNA codon?
Answer and explanation
Correct answer: A. The A (aminoacyl) site
During translation elongation, incoming aminoacyl-tRNAs bound to elongation factors enter the A (aminoacyl) site of the ribosome. Peptidyl transferase transfers the growing polypeptide chain from the tRNA in the P (peptidyl) site to the amino acid on the tRNA in the A site, followed by translocation where the uncharged tRNA moves to the E (exit) site and is released.
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