How does the transcription of structural genes in an inducible operon occur?
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, the transcription of structural genes can be turned on by the presence of a substrate in the pathway. This substrate acts as an inducer, which binds to a repressor protein and prevents it from binding to the operator region of the operon. This allows the RNA polymerase to bind to the promoter and initiate transcription.

How Does the Transcription of Structural Genes in an Inducible