Which of the following statement is correct about mesosomes ?

Options

A. They can be seen in both Gram positive and Gram negative bacteria
B. They may be involved in cell wall formation and cell division
C. They help in DNA replication
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Mesosomes**:
- Mesosomes are membrane folds found in bacterial cells. They are invaginations of the cell membrane that extend into the cytoplasm.

2. **Types of Mesosomes**:
- There are two types of mesosomes:
- **Central Mesosome**: This type holds bacterial DNA and plays a crucial role in DNA replication.
- **Peripheral Mesosome**: This type contains enzymes necessary for the Krebs cycle.

3. **Analyzing Statements**:
- The question asks which statement is correct about mesosomes. We need to evaluate the given options based on our understanding of mesosomes.

4. **Evaluating Each Statement**:
- **Statement 1**: Mesosomes can be seen in both Gram-positive and Gram-negative bacteria.
- This statement is true, but mesosomes are more prominent in Gram-positive bacteria.
- **Statement 2**: Mesosomes are involved in cell wall formation and cell division.
- This statement is also true as mesosomes play a role in these processes.
- **Statement 3**: Mesosomes help in DNA replication.
- This statement is true, specifically referring to the central mesosome.

5. **Conclusion**:
- All the statements provided about mesosomes are correct. Therefore, the answer to the question is that all statements regarding mesosomes are correct.