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NEETZoologyMolecular Basis of Inheritance

Match List-I with List-II regarding the genes of the lac operon and their products. List-I List-II a. i gene I. Transacetylase b. z gene II. Permease c. y gene III. -galactosidase d. a gene IV. Repressor Choose the correct answer from the options given below:

Options

  1. Aa-IV, b-II, c-III, d-I
  2. Ba-I, b-III, c-II, d-IV
  3. Ca-IV, b-III, c-I, d-II
  4. Da-IV, b-III, c-II, d-I

Correct answer

D. a-IV, b-III, c-II, d-I

Step-by-step solution

In the lac operon, the structural and regulatory genes code for specific proteins: The i gene codes for the repressor of the lac operon. The z gene codes for -galactosidase ( -gal), which is responsible for the hydrolysis of lactose. The y gene codes for permease, which increases the permeability of the cell to -galactosides. The a gene encodes a transacetylase. Therefore, the correct matching is a-IV, b-III, c-II, d-I. Swapping the products of the z and y genes or the y and a genes are common errors to avoid. Answ

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