Assing the following substances to cell wall, flagella, S -layer and pili of bacteria in proper sequence
(a) Glycoprotein , (b) Fimbrin//pilin
(c )Teichoic acid ,(d) Flagellin.

Options

A. c,a,d,b
B. c,d,a,b
C. b,d,c,a
D. c,d,b,a.

Answer

To assign the substances to the appropriate structures in bacteria, we will analyze each component and its association with the cell wall, flagella, S-layer, and pili.

### Step-by-Step Solution:

1. **Identify the components and their associations**:
- **Teichoic acid**: This substance is primarily found in the cell wall of Gram-positive bacteria. It is linked to the peptidoglycan layer.
- **Flagellin**: This is the protein that makes up the flagella, which are long, whip-like structures used for movement in bacteria.
- **Glycoprotein**: This component is typically found in the S-layer (surface layer) of bacteria, which is part of the cell envelope.
- **Fimbrin/Pilin**: These are proteins that make up pili (or fimbriae), which are hair-like appendages on the surface of bacteria used for attachment.

2. **Assign each component to its respective structure**:
- **Cell Wall**: Teichoic acid (C)
- **Flagella**: Flagellin (D)
- **S-layer**: Glycoprotein (A)
- **Pili**: Fimbrin/Pilin (B)

3. **Write the final sequence**:
- Based on the assignments, we have:
- Cell Wall → C (Teichoic acid)
- Flagella → D (Flagellin)
- S-layer → A (Glycoprotein)
- Pili → B (Fimbrin/Pilin)
- Therefore, the correct sequence is **CDAB**.

### Final Answer:
The correct sequence is **CDAB**.