What is not true of mycoplasma

Options

A. They completely lack cell wall
B. They are the smallest living cells known
C. They can survive without oxygen
D. non pathogenic.

Answer

### Step-by-Step Solution:

1. **Understanding Mycoplasma**:
- Mycoplasma are a group of bacteria that belong to the kingdom Monera. They are also known as pleuropneumonia-like organisms (PPLO) because they were first identified in cattle suffering from pneumonia.

2. **Characteristics of Mycoplasma**:
- Mycoplasma are the smallest known living cells. This characteristic is true.
- They completely lack a cell wall, which is a distinguishing feature compared to other bacteria that typically have a cell wall.
- Mycoplasma can survive in environments without oxygen, indicating that they are anaerobic.

3. **Evaluating the Statements**:
- The first statement about Mycoplasma lacking a cell wall is true.
- The second statement about them being the smallest living cells is also true.
- The third statement regarding their ability to survive without oxygen is true as well.
- The fourth statement claims that Mycoplasma are non-pathogenic. This statement is false because Mycoplasma can be pathogenic to both plants and animals.

4. **Conclusion**:
- Since the question asks for what is not true of Mycoplasma, the correct answer is the fourth statement, which says they are non-pathogenic.

### Final Answer:
The statement that is not true of Mycoplasma is: **They are non-pathogenic.**

---