Protein Synthesis
The direction of amino acid transfer to the growing polypeptide chain is

from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
from the P site to the E site on the ribosome
from the A site to the E (exit tRNA site) site on the ribosome
from the P site to the A site on the ribosome

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