In the presence of the repressor molecule and free tryptophan,the trp operon is:
A)constitutively transcribed.
B)derepressed.
C)induced.
D)repressed.
E)transcribed but not translated.

Question

Quizplus · Accepted Answer

In the presence of repressor molecule and free tryptophan, the repressor binds to the operator region of the trp operon, preventing RNA polymerase from transcribing the genes. This is known as repression, so the correct answer is D.

In the Presence of the Repressor Molecule and Free Tryptophan,the