Question

Match List I with List II.

	List-I		List-II
(a)	Gene ‘a’	(i)	β-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:

• A. A-II, B-III, C-IV, D-I
• B. A-III, B-IV, C-I, D-II
• C. A-III, B-I, C-IV, D-II
• D. A-II, B-I, C-IV, D-III

Answer 1

The Correct Option is A

To solve the problem of matching List I with List II, we need to understand the function of each gene mentioned in the lac operon model of Escherichia coli.

1. Gene ‘a’: This gene encodes the enzyme transacetylase. Therefore, it corresponds to the function in List II labeled as (ii) Transacetylase.
2. Gene ‘y’: This gene is responsible for encoding permease, which is involved in the transport of lactose into the cell. Thus, it matches the function labeled as (iii) Permease in List II.
3. Gene ‘i’: Known for its role in creating the repressor protein that can inhibit the expression of the structural genes. Hence, it corresponds to (iv) Repressor protein in List II.
4. Gene ‘z’: This gene encodes the enzyme β-galactosidase, which catabolizes lactose into glucose and galactose. Therefore, it matches with (i) β-galactosidase in List II.

Matching List I with List II, we get: 

(a) Gene ‘a’ - (ii) Transacetylase

(b) Gene ‘y’ - (iii) Permease

(c) Gene ‘i’ - (iv) Repressor protein

(d) Gene ‘z’ - (i) β-galactosidase

Thus, the correct option is:

A-II, B-III, C-IV, D-I