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In operan concept, the operator gene combines with (A) Regulator protein to switch off structural gene transcription

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In operan concept, the operator gene combines with

(A) Regulator protein to switch off structural gene transcription 

(B) Regulator protein to switch on structural gene transcription 

(C) Inducer to switch off structural gene transcription 

(D) Regulator gene to switch off structural gene transcription

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(A) Regulator protein to switch off structural gene transcription

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