Complex sentence: The genes of prokaryotes are grouped together based on similar functions into units called operons which consist of a promoter and an operator, the binding site for the repressor and thus acts as equivalent to the silencer region in Eukaryotic DNA.
Split into simpler sentences: The genes of prokaryotes are grouped together based on similar functions into units called operons which consist of a promoter and an operator. The operator is the binding site for the repressor and thus has a function equivalent to the silencer region in Eukaryotic DNA.