Select the wrong statement.

Options

A. Bacterial cell wall is made up of peptidioglycan
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 "Select the wrong statement," we will analyze each of the provided statements regarding bacterial structure and function.

### Step-by-Step Solution:

1. **Statement 1: Bacterial cell wall is made up of peptidoglycan.**
- This statement is **true**. Bacterial cell walls are primarily composed of peptidoglycan, which is a polymer consisting of sugars and amino acids.

2. **Statement 2: Pili and fimbriae are mainly involved in motility of bacterial cells.**
- This statement is **false**. Pili and fimbriae are structures that help bacteria adhere to surfaces and are not primarily involved in motility. The main structure responsible for bacterial motility is the flagellum.

3. **Statement 3: Cyanobacteria lack flagellated cells.**
- This statement is **true**. Cyanobacteria do not have flagella and move by gliding or sliding motion rather than swimming.

4. **Statement 4: Mycoplasma is a wall-less microorganism.**
- This statement is **true**. Mycoplasma are a genus of bacteria that do not have a cell wall, which makes them unique among bacteria.

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