For synthesis of an inducible enzyme to occur,
A) a compound must bind to the repressor.
B) a compound must bind to the operator.
C) a product must bind to the terminator.
D) a corepressor must bind to the start codon.
E) lactose must be present without fructose.

Question

For synthesis of an inducible enzyme to occur, 
A) a compound must bind to the repressor.
B) a compound must bind to the operator.
C) a product must bind to the terminator.
D) a corepressor must bind to the start codon.
E) lactose must be present without fructose.

Quizplus · Accepted Answer

In an inducible system, the repressor binds to the operator, inhibiting transcription of the gene. To allow synthesis of the inducible enzyme, a small molecule inducer must bind to the repressor, causing a conformational change that releases the repressor from the operator, allowing RNA polymerase to transcribe the gene.

For Synthesis of an Inducible Enzyme to Occur