Protein Synthesis
The lac operon contains the z, y and a structural genes

encoding P-galactosidase only
encoding p-galactosidase and galactose permeases
None of these
encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively

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Protein Synthesis
The first step in translation is

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

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

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 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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