AP Biologymediummcq1 pt
A mutation deletes the lac repressor gene. The result is
A.expression that is constitutive with respect to lactose/repressor control
B.permanent repression of the operon
C.no change in expression
D.death of the cell
Explanation
Core Concept
Without the lac repressor, the operator can no longer be blocked in response to lactose availability, so the operon becomes constitutive with respect to that negative-control system. Transcription level can still be influenced by other regulatory inputs such as glucose availability through CAP–cAMP.
Correct Answer
Aexpression that is constitutive with respect to lactose/repressor control
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