Which of the following statements most accurately describes the expression of the repressor protein of the tryptophan operon?
a. The gene for the tryptophan repressor is turned on in response to high levels of tryptophan in the cell.
b. The gene for the tryptophan repressor is turned off in response to high levels of tryptophan in the cell.
c. The gene for the tryptophan repressor is turned on in response to low levels of tryptophan in the cell.
d. The gene for the tryptophan repressor is turned off in response to low levels of tryptophan in the cell.
e. The gene for the tryptophan repressor is expressed constitutively.
Ans: e. The gene for the tryptophan repressor is expressed constitutively.
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