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In an E. coli cell according to operon theory an operator gene combines with:
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[A]. |
Regulator gene to "Switch off" structural gene transcription | [B]. |
Regulator protein to "switch off" structural gene transcription
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[C]. |
Regulator protein to "switch on" structural gene transcription | [D]. |
Inducer gene to "switch on" structural gene transcription |
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