In the absence of tryptophan,____________ .
A) the repressor binds the corepressor, and operon gene transcription occurs
B) the active repressor binds trpP, so operon gene transcription is repressed
C) the inducer cannot bind trpO, so operon gene transcription occurs
D) the inactive repressor cannot bind trpO, so operon gene transcription occurs
E) the active repressor cannot bind trpO, so operon gene transcription is attenuated

Question

Quizplus · Accepted Answer

In the absence of tryptophan, the repressor protein is inactive and cannot bind to the operator region (trpO) of the operon. This allows RNA polymerase to bind to the promoter and transcribe the genes necessary for tryptophan synthesis, leading to operon gene transcription.

In the Absence of Tryptophan,____________