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AIIMS2018Biology-Molecular Basis of Inheritance

AIIMS 2018 Biology Lac Operon MCQ Question

Type: MCQ-conceptual-Hard-Class 12

In the Diagram given figure of Lac operon

PiPozya\begin{array}{|c|c|c|c|c|c|c|} \hline \text{P} & \text{i} & \text{P} & \text{o} & \text{z} & \text{y} & \text{a} \\ \hline \end{array}

A

i-Repressor, z-β\beta-galactosidase, y-Permease, a-Transacetylase

B

i-Inhibitor, z-Repressor, y-Transacetylase, a-Permease

C

i-Inducer, z-β\beta-galactosidase, y-Permease, a-Repressor

D

i-β\beta-galactosidase, z-Repressor, y-Permease, a-Transacetylase

Correct Answer

Option A

Detailed Explanation

In the Lac operon, the i gene encodes the repressor protein, which inhibits the transcription of downstream genes when lactose is absent. The z gene encodes β-galactosidase, which breaks down lactose into glucose and galactose, while the y gene encodes permease, facilitating lactose entry into the cell. The a gene encodes transacetylase, which is involved in the metabolism of lactose. Since options B, C, and D are marked as N/A, they do not provide any relevant information or alternatives regarding the components of the Lac operon.

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