Mutation of what would convert the lac operon to an OR gate?
A) An operator sequence,so that it was constitutive.
B) A cis-element so either inducer was sufficient for transcription.
C) An operon so that only lacZ or lacY was transcribed at any time.
D) The promoter so that it would not bind RNA polymerase.
E) The repressor so that it could not bind allolactose.

Question

Quizplus · Accepted Answer

The lac operon functions as an AND gate, where both lactose (inducer) and absence of glucose (catabolite activator protein, CAP) are required for transcription. A mutation in the cis-element, such that either lactose or absence of glucose was sufficient for transcription, would create an OR gate instead. Mutations in the other options would not change the gate type of the lac operon.

Mutation of What Would Convert the Lac Operon to an OR Gate