Protein Synthesis
The peptidyl transferase reaction occurs

between the subunit
on the large subunit
on the small subunit
none of these

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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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Protein Synthesis
The first step in translation is

binding of mRNA to the two ribosomal subunits
binding of the two ribosomal subunits to each other
binding of mRNA to the small ribosomal subunit
binding of tRNA to the small ribosomal subunit

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