Match column I with II column II and select the correct option from the given codes .
`{:("Column I","Column II"),(A."Operator site",(i)"Binding site for RNA polymerase"),(B."Promoter site",(ii)"Binding site for repressor molecule"),(C."Regulator gene",(iii)"Codes for protein/enzyme"),(D."Structural gene",(iv)"Codes for repressor molecule"):}`

Options

A. A-(ii), B-(i), C-(iii), D-(iv)
B. A-(ii), B-(i), C-(iv), D-(iii)
C. A-(iv), B-(iii), C-(i), D-(ii)
D. A-(ii), B-(iii), C-(i), D-(iv)

Answer

To solve the matching question between Column I and Column II, we need to understand the functions of each component listed in Column I and how they relate to the descriptions provided in Column II.

### Step-by-Step Solution:

1. **Identify the Components in Column I:**
- A. Operator site
- B. Promoter site
- C. Regulator gene
- D. Structural gene

2. **Identify the Descriptions in Column II:**
- (i) Binding site for RNA polymerase
- (ii) Binding site for repressor molecule
- (iii) Codes for protein/enzyme
- (iv) Codes for repressor molecule

3. **Match Each Component with Its Description:**
- **A. Operator site**: The operator site is where the repressor molecule binds to inhibit transcription. Therefore, it matches with (ii) Binding site for repressor molecule.
- **B. Promoter site**: The promoter site is where RNA polymerase binds to initiate transcription. Thus, it matches with (i) Binding site for RNA polymerase.
- **C. Regulator gene**: The regulator gene codes for the repressor molecule that can bind to the operator. Hence, it matches with (iv) Codes for repressor molecule.
- **D. Structural gene**: The structural gene codes for proteins or enzymes necessary for various cellular functions. Therefore, it matches with (iii) Codes for protein/enzyme.

4. **Final Matching:**
- A → (ii)
- B → (i)
- C → (iv)
- D → (iii)

### Summary of Matches:
- A (Operator site) → (ii) Binding site for repressor molecule
- B (Promoter site) → (i) Binding site for RNA polymerase
- C (Regulator gene) → (iv) Codes for repressor molecule
- D (Structural gene) → (iii) Codes for protein/enzyme

### Correct Option:
Based on the matching, the correct option would be:
- A → ii
- B → i
- C → iv
- D → iii