Question

Match the following (Lac Operon Components).

• A. A-II, C-III, B-I, D-IV
• B. A-II, B-I, C-IV, D-III
• C. A-IV, C-I, B-III, D-II
• D. A-II, B-III, C-I, D-IV

Hint:

Promoter $\rightarrow$ RNA Polymerase Binding Operator $\rightarrow$ Repressor Binding Regulator Gene $\rightarrow$ Repressor Protein

Answer 1

The Correct Option is B

Concept: The Lac Operon consists of regulator gene, promoter, operator and structural genes which together regulate lactose metabolism in bacteria.

Step 1: Operator Site.
Operator is the binding site for: \[ \boxed{\text{Repressor molecule}} \] Hence: \[ A \rightarrow II \]

Step 2: Promoter Site.
RNA polymerase binds to promoter. \[ B \rightarrow I \]

Step 3: Regulator Gene.
Produces repressor protein. \[ C \rightarrow IV \]

Step 4: Structural Genes.
Code for enzymes required for lactose metabolism. \[ D \rightarrow III \] Final matching: \[ \boxed{A-II,\;B-I,\;C-IV,\;D-III} \] Hence option (B).