Which of the following is required as inducer$(s)$ for the expression of $Lac$ operon?

Which one of the following enzymes is required for the entry of lactose into the $E. coli$ cell?

$E. coli$ cells with a mutated $Z$ gene of the $lac$ operon cannot grow in a medium containing only lactose as the source of energy because:

Mark the incorrect option with respect to the $lac$ operon.

An environmental agent that triggers transcription from an operon is a:

In the $lac$ operon,which gene is responsible for coding the repressor protein?