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.

Similar Questions

The regulatory genes are located

Match List $-I$ with List $-II$ :

List $-I$ List $-II$
$a$ In lac operon $i$ gene codes for $i$ transacetylase
$b$ In lac operon $z$ gene codes for $ii$ permease
$c$ In lac operon $y$ gene codes for $iii$ $\beta$ - galactosidase
$d$ In lac operon $a$ gene codes for $iv$ Repressor

Choose the correct answer from the options given below :

  • [NEET 2022]

In Operon concept, regulator gene functions as

  • [AIPMT 1999]

In an Ecolistrain $i$ gene gets mutated and its product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome?

  • [NEET 2022]

Definitions/Explanation : Regulatorgene & Promotergene