Protein Synthesis
The growing polypeptide chain is released from the ribosomes when

the 7-methyl guanosine cap is reached
a chain terminating tRNA binds to the ribosome
the poly A tail is reached
a chain terminating codon is reached

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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 A 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

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