This is because the genes
that make up an operon are related in function
since they transcribe for the different subunits
of a functional protein or enzyme. Operons, therefore, make regulation of functional
proteins more efficient since its an all
or none type of regulation. No subunits
will be transcribed independently and not get involved in making a
functional protein (due to lack of other
subunits that are not yet transcribed)
hence no wastage.
