Under which condition do high levels of transcription of structural genes occur in an inducible operon?
A) It occurs continuously in the cell.
B) It starts when the pathway's substrate is present.
C) It starts when the pathway's product is present.
D) It stops when the pathway's product is present.

Question

Quizplus · Accepted Answer

In an inducible operon, high levels of transcription of structural genes occur when the substrate for the pathway controlled by the operon is present. This substrate acts as an inducer, binding to a repressor protein and preventing it from repressing the operon, thus allowing transcription to proceed.

Under Which Condition Do High Levels of Transcription of Structural