Regulation of Protein Synthesis

 

Must have method to either turn genes "on" or else turn them "off"

            Else all cells would make same enzymes

 

Regulation in bacteria

            Structural gene

            Regulatory gene

            Operon

 

lac operon (Escherichia coli)

            three kinds of regulatory genes

                        promoter site

                        operator site

                        regulator gene

 

            control activity of RNA polymerase to control transcription

            inducer molecule = lactose