An inducer molecule binds to and inactivates the repressor

An inducer molecule competes with the repressor for binding to the operator

An activator protein displaces the repressor on the operator

A second repressor protein binds to and represses the repressor

The transcription of the repressor protein is inactivated

Large concentrations of glucose and large concentrations of lactose

Large concentrations of cAMP and large concentrations of glucose

Low concentrations of cAMP and large concentrations of lactose

Large concentrations of cAMP and large concentrations of lactose

Operons

Promoters

Operators

Repressors

Activators

Maybe; it depends on the concentration of glucose

Yes; the lactose sugars remove the repressor and the genes will be transcribed rigorously

Yes; the lactose sugars bind transcription factors that turn on transcription

No; the lac operon does not utilize lactose sugars in its regulatory mechanism

Constitutive expression of the lac operon

Lactose cannot enter the cell

Lactose can enter the cell, but cannot be broken down

No expression of the operon; RNA polymerase cannot bind properly