Mesosomes are the infoldings of cell membrane, which
(i) are present in both prokaryotic and equkaryotic cells.
(ii) help in cell wall formation, DNA replication and respiration.
(iii) increase the surface area of plasma membrane.

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. (i), (ii) and (iii)

Explanation

To solve the question regarding mesosomes, we will evaluate each statement provided in the question systematically.

### Step-by-Step Solution:

1. **Understanding Mesosomes**:
- Mesosomes are infoldings of the cell membrane found in prokaryotic cells, particularly bacteria. They are not found in eukaryotic cells.

2. **Evaluating Statement (i)**:
- The first statement claims that mesosomes are present in both prokaryotic and eukaryotic cells.
- **Conclusion**: This statement is **incorrect** because mesosomes are only found in prokaryotic cells.

3. **Evaluating Statement (ii)**:
- The second statement states that mesosomes help in cell wall formation, DNA replication, and respiration.
- **Conclusion**: This statement is **correct**. Mesosomes are involved in these processes, similar to how mitochondria function in eukaryotic cells.

4. **Evaluating Statement (iii)**:
- The third statement claims that mesosomes increase the surface area of the plasma membrane.
- **Conclusion**: This statement is also **correct**. The infoldings of mesosomes do increase the surface area, which can enhance the efficiency of various cellular processes.

5. **Final Evaluation**:
- Based on the analysis:
- Statement (i) is incorrect.
- Statements (ii) and (iii) are correct.
- Therefore, the answer to the question is that statements (ii) and (iii) are correct.

### Final Answer:
The correct statements about mesosomes are (ii) and (iii).

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