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

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

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Protein Synthesis
Type I proteins (plasma membrane) have a

cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
multiple signal sequence and a hydrophobic stop transfer sequence
cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence
multiple signal sequence that doubles as the membrane anchoring sequence

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Protein Synthesis
Translation in prokaryotes begins by the formation of a 30S initiation complex between the

30S ribosomal subunit, mRNA and initiation factors
30S ribosomal subunit, tRNA and initiation factors
30S ribosomal subunit and mRNA only
30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA

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