Which one is correct about mesosome ?

Options

A. A characteristic of bacteria
B. Infolding of cell membrane
C. May be in the form of vesicles, tubules or lamellae
D. All are correct

Answer

### Step-by-Step Solution:

1. **Understanding Mesosomes**: Mesosomes are structures found in bacteria that are formed by the invagination (folding inward) of the plasma membrane. They are not present in eukaryotic cells.

2. **Forms of Mesosomes**: Mesosomes can take various forms, including vesicles, tubules, or lamellae. This variability indicates that mesosomes can have different structural configurations depending on the bacterial species.

3. **Presence in Bacteria**: Mesosomes are characteristic of both Gram-positive and Gram-negative bacteria. However, they are more prominent in Gram-positive bacteria.

4. **Functions of Mesosomes**: Mesosomes play a crucial role in several cellular processes:
- They are involved in chromosome replication, which is essential for cell division.
- They also assist in the formation of the cross wall during bacterial cell division, which is important for the separation of daughter cells.

5. **Conclusion**: Given the characteristics and functions of mesosomes, we can conclude that all the statements regarding mesosomes are correct. Therefore, the correct answer is that all options related to mesosomes are true.