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 Jacques Monod.
The correct statements are
(a) I and III
(b) I and III.
(c) II and IV
(d) I and II
[CBSE AIPMT 2010]