Which of the following is required as an inducer for the expression of the $lac$ operon?

What does the $i$ gene encode in the $lac$ operon?

Which of the following statements is incorrect regarding the $lac$ operon?

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

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?

In the term $lac$ operon,what does the term $lac$ refer to?