Protein Synthesis
Ribosomes select the correct tRNAs

then bind to the appropriate mRNA
depending on their abundance in the cytosol
solely on the basis of their anticodons
with the least abundant anticodons

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

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

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