In the absence of tryptophan, __________.
A)the inactive repressor cannot bind trpO, so 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 active repressor cannot bind trpO, so operon gene transcription is attenuated
E)the repressor binds the corepressor, and operon gene transcription occurs

Question

Quizplus · Accepted Answer

In the absence of tryptophan, there will not be enough tryptophan molecules to bind to the inactive repressor to activate it. Therefore, the inactive repressor cannot bind to trpO, which allows for the transcription of the genes in the operon.

In the Absence of Tryptophan, __________