Question

Select the correct statements about $lac$ operon.
(1) Glucose or galactose may bind with the represser and inactivate it
(2) In the absence of lactose, the represser binds with the operator region
(3) The Z-gene codes for permease
(4) This was elucidated by Francois Jacob and Jacques Monod

• A. 1, 2 and 3 are correct
• B. 1 and 2 are correct
• C. 2 and 4 are correct
• D. 1 and 3 are correct

Answer 1

Answer: (C)

In prokaryotes, a hypothesis was given in $1961$ to explain the protein synthesis regulation. This hypothesis was given by F Jacob and J Monod and for this awarded Nobel Prize in $1965$, the hypothesis was known by the name of Operon model. The operator gene is the segment of DNA, which exercise a control over transcriptions. In the absence of lactose the represser binds with the operator gene.