| (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. |
A) (ii) and (iii)
B) (i) and (iii)
C) (ii) and (iv)
D) (i) and (ii)
Correct Answer: C
Solution :
[c] Jacob and Monod proposed the lac operon of E. coli. The lac operon contains a promoter, an operator, and three structural genes called z, y, and a, coding for the enzyme \[\beta \] galactosidase, permease and transacetylase respectively. The lac regulator gene, designated as: gene, codes for repressor. In the absence of the inducer the repressor binds to the lac operator preventing RNA polymerase from binding to the promoter and thus transcribing the structural gene.
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