$i.$ Glucose or galactose may bind with the repressor and inactivate it.
$ii.$ In the absence of lactose, the repressor binds with the operator region.
$iii.$ The z-gene codes for permease.
$iv.$ This was elucidated by Francois Jacob and Jacque Monod.
| Column $– I$ | Column $– II$ |
| $(A)\; AUG$ | $(1)$ Phenyl alanine |
| $(B) \;UAA$ | $(2)$ Methionine |
| $(C)\;UUU$ | $(3)$ Tryptophan |
| $(D) \;UGG$ | $(4)$ Stop |