Question

Match the following genes of the lac operon listed in column ‘A’ with their respective products listed in column ‘B’: \begin{center} \begin{tabular}{|c|c|} \hline Column A (Gene) & Column B (Product)
\hline a. ‘i’ gene & (i) \(\beta\)-galactosidase
b. ‘z’ gene & (ii) Lac permease
c. ‘a’ gene & (iii) Repressor
d. ‘y’ gene & (iv) Transacetylase
\hline \end{tabular} \end{center} Select the correct option:

• A. a–(i), b–(iii), c–(ii), d–(iv)
• B. a–(iii), b–(i), c–(iv), d–(ii)
• C. a–(iii), b–(i), c–(ii), d–(iv)
• D. a–(iii), b–(ii), c–(iv), d–(i)

Hint:

The lac operon is a classic example of gene regulation in prokaryotes, controlled by the presence or absence of lactose in the environment.

Answer 1

The Correct Option is B

‘i’ gene: Encodes the repressor protein. This protein blocks operon transcription when lactose is absent. ‘z’ gene: Encodes \(\beta\)-galactosidase. This enzyme breaks down lactose into glucose and galactose. ‘a’ gene: Encodes transacetylase. This enzyme adds an acetyl group to \(\beta\)-galactosides. ‘y’ gene: Encodes lac permease. This protein aids in transporting lactose into the cell.