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NEETZoologyMolecular Basis of Inheritance

Match the genes of the lac operon in List-I with their respective protein products in List-II. List-I List-II (A) i gene (I) Transacetylase (B) z gene (II) Permease (C) y gene (III) -galactosidase (D) a gene (IV) Repressor protein Choose the correct answer from the options given below:

Options

  1. A(A)-(IV), (B)-(II), (C)-(III), (D)-(I)
  2. B(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
  3. C(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  4. D(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Correct answer

B. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

Step-by-step solution

The lac operon consists of one regulatory gene and three structural genes. The i gene codes for the repressor protein of the lac operon. The z gene codes for -galactosidase, which is primarily responsible for the hydrolysis of lactose into galactose and glucose. The y gene codes for permease, which increases the permeability of the cell to -galactosides. The a gene codes for a transacetylase. Therefore, the correct match is (A)-(IV), (B)-(III), (C)-(II), (D)-(I). Answer: (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

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