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#Question id: 2659


The correct option regarding the lac operon in E.coli from the following is

#XL - T Zoology
  1. Lac operon is switched on in the absence of lactose

  2. Lac repressor binds to the lac promoter

  3. β-galactosidase is the only enzyme produced in large quantities when lac operon is turned on

  4. lac operon messenger RNA is a polycistronic mRNA


Answer:- Option(s): 4


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