Question: 151 Match List I with List II.
| List I | List II |
|---|---|
| A. Gene ‘a’ | I. \beta-galactosidase |
| B. Gene ‘y’ | II. Transacetylase |
| C. Gene ‘ i ‘ | III. Permease |
| D. Gene ‘z’ | IV. Repressor protein |
Choose the correct answer from the options given below:
(1) A-III, B-IV, C-I, D-II
(2) A-III, B-I, C-IV, D-II
(3) A-II, B-I, C-IV, D-III
(4) A-II, B-III, C-IV, D-I
Answer: Option (4)
Explanation:
This question is based on the lac operon of Escherichia coli.
Gene ‘a’ codes for the enzyme transacetylase, which is involved in lactose metabolism.
Gene ‘y’ codes for permease, which helps in the transport of lactose into the bacterial cell.
Gene ‘i‘ is the regulatory gene and codes for the repressor protein.
Gene ‘z’ codes for the enzyme \beta-galactosidase,
which hydrolyses lactose into glucose and galactose.
Therefore, the correct matching is A-II, B-III, C-IV and D-I.