Select the wrong statement

Options

A. Bacteria cell wall is made up of peptidoglcyan
B. Pili and fimbriae are mainly involved in motility of bacterial cells
C. Cyanobacteria lack flagellated cells
D. Mycoplasma is a wall-less microorganism

Answer

To solve the question of selecting the wrong statement among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Option 1: Bacterial cell wall is made up of peptidoglycan.**
- **Analysis:** This statement is true. The cell wall of bacteria is primarily composed of peptidoglycan, which is a polymer consisting of sugars and amino acids. It provides structural support and protection to the bacterial cell.
- **Conclusion:** This statement is correct.

2. **Option 2: Pili and fimbriae are mainly involved in the motility of bacterial cells.**
- **Analysis:** This statement is incorrect. Pili and fimbriae are hair-like structures on the surface of bacteria. While they play roles in attachment to surfaces and other cells, they are not primarily involved in motility. Instead, flagella are the structures responsible for bacterial movement.
- **Conclusion:** This statement is wrong.

3. **Option 3: Cyanobacteria lack flagellated cells.**
- **Analysis:** This statement is true. Cyanobacteria are known to be non-flagellated and can be motile through gliding mechanisms, but they do not possess flagella.
- **Conclusion:** This statement is correct.

4. **Option 4: Mycoplasma is a wall-less microorganism.**
- **Analysis:** This statement is true. Mycoplasma are indeed wall-less bacteria and are among the smallest known prokaryotes. They have a flexible plasma membrane instead of a rigid cell wall.
- **Conclusion:** This statement is correct.

### Final Conclusion:
The wrong statement among the options provided is **Option 2: Pili and fimbriae are mainly involved in the motility of bacterial cells.**