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

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

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Protein Synthesis
The first step in translation is

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

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