Which of the following correctly describes the function of the repressor protein controlling expression of the trp operon?
A)In the presence of tryptophan,the trp repressor tryptophan complex binds the operator inhibiting transcription.
B)In the absence of tryptophan,the trp repressor tryptophan complex binds the operator inhibiting transcription.
C)In the presence of tryptophan,the trp repressor tryptophan complex binds the operator enhancing transcription.
D)In the absence of tryptophan,the trp repressor tryptophan complex binds the operator enhancing transcription.
E)None of the above.

Question

Quizplus · Accepted Answer

The repressor protein controlling the trp operon is typically inactive unless it binds to the co-repressor tryptophan. In the presence of tryptophan, the repressor tryptophan complex forms and binds to the operator, inhibiting transcription. Therefore, choice A accurately describes the function of the trp repressor protein.

Which of the Following Correctly Describes the Function of the Repressor