Which of the Following Substances is the Inducer for the Lac

Question

Which of the following substances is the inducer for the lac operon?
A) Lactose
B) Tryptophan
C) cAMP
D) Glucose
E) CAP

Accepted Answer

Lactose is the inducer for the lac operon, meaning it causes the lac operon to be expressed. When lactose is present in the cell, it is converted to allolactose which binds to the repressor protein and prevents it from binding to the operator region, allowing transcription of the operon to occur.