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Which is true for repressible operon

  1. text  Off  end text not stretchy ⟶ with text  Inducer  end text on top text  on end text    
  2. Inactive repressor + Co-repressor = active repressor    
  3. Active repressor + Inducer = inactive repressor    
  4. text  On  end text not stretchy ⟶ with text  Inducer  end text on top text  off  end text    

The correct answer is: Inactive repressor + Co-repressor = active repressor

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