Given below is the representation of the $lac$ operon of $E. coli$. Identify $I$ and $II$ from the options given below.

$I$

Promoter

$II$

$Z$

$Y$

$A$

Lac operon is:

Select two correct statements from the four $(a-d)$ given below regarding the $lac$ operon.
$(A)$ Glucose or galactose may bind with the repressor gene and induce inactivity.
$(B)$ In the absence of lactose,the repressor binds with the operator region.
$(C)$ The $z$-gene codes for permease.
$(D)$ This was elucidated by Francois Jacob and Jacques Monod.
Which of the following are the correct statements?

Genes that are involved in turning on or off the transcription of a set of structural genes are called:

$Y$ gene in $lac$ operon is responsible for .....

What is the structural gene equivalent to?