Question

Match List-I with List-II:

List-I (Genes)	List-II (Proteins– Codes for lac operon)
(A) i	(I) permease
(B) a	(II) β-galactosidase
(C) y	(III) transacetylase
(D) z	(IV) repressor

Choose the correct answer from the options given below:

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

Answer 1

The Correct Option is B

To solve the problem, we need to match the genes in List-I with the proteins they code for in the lac operon found in List-II. Let's break down the components of the lac operon: 

• Gene 'i' (A): This gene codes for the repressor protein, which binds to the operator region to regulate the operon. Therefore, it matches with (IV) repressor.
• Gene 'a' (B): It codes for transacetylase, an enzyme involved in the latent metabolism of lactose. Therefore, it matches with (III) transacetylase.
• Gene 'y' (C): This gene codes for permease, a protein that facilitates the entry of lactose into the bacterial cell. Therefore, it matches with (I) permease.
• Gene 'z' (D): Responsible for coding β-galactosidase, the enzyme that hydrolyzes lactose into glucose and galactose. Therefore, it matches with (II) β-galactosidase.

Based on the above matching:

The correct option is: (A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Answer 2

The lac operon is a well-studied model of gene regulation in bacteria. The genes in the lac operon code for proteins that help metabolize lactose. Here's the correct match of genes with their corresponding proteins:

• (A) i - (IV) repressor: The i gene codes for the repressor protein, which binds to the operator and prevents transcription when lactose is absent.
• (B) a - (III) transacetylase: The a gene codes for transacetylase, which is involved in the modification of lactose.
• (C) y - (I) permease: The y gene codes for permease, which facilitates the transport of lactose into the cell.
• (D) z - (II) β-galactosidase: The z gene codes for β-galactosidase, which breaks down lactose into glucose and galactose.