If the lacI repressor gene was permanently silenced by a DNA mutation, what would be the impact on the expression
of the lac operon?
a. The lac operon would only be expressed if glucose was absent.
b. The lac operon would always be expressed.
c. There would be no impact on lac operon expression.
d. The lac operon would only be expressed when lactose was present.
e. The lac operon would never be expressed.
ANSWER: b
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