An Operon Is Controlled by a Repressor

Multiple Choice

An operon is controlled by a repressor.When the repressor binds to a small molecule, it is released from binding to DNA near the operon.The operon is never expressed if a mutation prevents the repressor from binding to the small molecule.The type of control illustrated is:

A) negative inducible.
B) negative repressible.
C) positive inducible.
D) positive repressible.