Which of the following is true for the $Trp$ operon?

  • A
    It is an example of an inducible operon.
  • B
    It is an example of a repressible operon.
  • C
    It follows the mechanism: $ON \xrightarrow{co-repressor} OFF$.
  • D
    Both $(B)$ and $(C)$ are correct.

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The end product of a metabolic pathway binds to the operator to make it more active,so that it can easily bind with the repressor. In this case,the end product is called a/an ......

When does $lac$ operon in $E. coli$ become "switched on"?

$A$: Operator gene is functional when it is not blocked by repressor.
$R$: Regulator gene produces active protein only which acts on operon system in $E. coli$.

The equivalent of a structural gene is

Which one of the following sets contains enzymes coded by the structural genes of the $lac$ operon of $E. coli$?

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