Back to Practice
AIIMS2018Botany-Molecular Basis of Inheritance

AIIMS 2018 Botany 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.

Found an issue with this question?

Related Questions

Explore More Questions

All Botany QuestionsMolecular Basis of Inheritance QuestionsAIIMS 2018 PYQ