Gene regulation governing lactose operon of E.coli that involves the lac $I$ gene product is

  • [NEET 2015]
  • A

    negative and repressible because repressorprotein prevents transcription

  • B

    feedback inhibition because excess of bgalactosidasecan switch off transcription

  • C

    positive and inducible because it can beinduced by lactose

  • D

    negative and inducible because repressorprotein prevents transcription.

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In the lactose operon of Escherichia coli, what is the function of promoter

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  • [NEET 2024]

The genes are responsible for growth and differentiation in an organism through regulation of

Select the two correct statements out of the four $(i-iv)$ given below about lac operon.

$i.$ Glucose or galactose may bind with the repressor and inactivate it.

$ii.$ In the absence of lactose, the repressor binds with the operator region.

$iii.$ The z-gene codes for permease.

$iv.$ This was elucidated by Francois Jacob and Jacque Monod.