Select the wrong statement

Options

A. Mycoplasma is a wall less microoganisms
B. Bacterial cell wall is made up of peptidoglycan
C. Pili and fimbriae are mainly involved in mobility of bacterial cells
D. Cyanobacteria lack flagellated cells

Answer

To solve the question of selecting the wrong statement regarding cell structure, we will analyze each of the provided statements step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** Mycoplasma is a wall-less microorganism.
- **Explanation:** Mycoplasma is indeed a wall-less microorganism, which is the smallest prokaryotic organism. It lacks a cell wall but has a rigid plasma membrane rich in sterols and lipoglycans.
- **Conclusion:** This statement is **True**.

2. **Analyze the Second Statement:**
- **Statement:** Bacterial cell wall is made up of peptidoglycan.
- **Explanation:** The bacterial cell wall is primarily composed of peptidoglycan, which consists of long glycan chains with alternating N-acetylglucosamine and N-acetylmuramic acid.
- **Conclusion:** This statement is **True**.

3. **Analyze the Third Statement:**
- **Statement:** Pili and fimbriae are mainly involved in the mobility of bacterial cells.
- **Explanation:** Pili (and fimbriae) are hair-like structures that help bacteria attach to surfaces. They do not play a significant role in mobility; instead, they are primarily for adherence.
- **Conclusion:** This statement is **False**.

4. **Analyze the Fourth Statement:**
- **Statement:** Cyanobacteria lack flagellated cells.
- **Explanation:** Cyanobacteria can be motile or non-motile, but they are known to be non-flagellated organisms. Therefore, they do not have flagella for movement.
- **Conclusion:** This statement is **True**.

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