To determine which statements regarding mesosomes are true, let's analyze each statement step by step.
### Step 1: Analyze Statement A
**Statement A:** Mesosomes may be present in the form of vesicles, tubules, and lamellae.
- **Explanation:** Mesosomes are indeed infoldings of the plasma membrane in prokaryotic cells and can take various forms, including vesicles (globular structures), tubules (cylindrical structures), and lamellae (sheet-like structures).
- **Conclusion:** This statement is **true**.
### Step 2: Analyze Statement B
**Statement B:** Mesosomes help in cell wall secretion, cell respiration, DNA replication, and cell division.
- **Explanation:** Mesosomes play a crucial role in various cellular processes in prokaryotes, including cell wall synthesis, respiration, and DNA replication. They are involved in the division of the cell as well.
- **Conclusion:** This statement is **true**.
### Step 3: Analyze Statement C
**Statement C:** Mesosomes increase the surface area of the cell wall and enzymatic content.
- **Explanation:** The infolding of the membrane (mesosomes) does increase the surface area available for various biochemical reactions, which can enhance enzymatic activity. Thus, they do contribute to increasing the enzymatic content available for metabolic processes.
- **Conclusion:** This statement is **true**.
### Step 4: Analyze Statement D
**Statement D:** Mesosomes contain oxidative enzymes.
- **Explanation:** Mesosomes are involved in cellular respiration in prokaryotes and are known to contain enzymes that facilitate this process, including oxidative enzymes. While oxidative enzymes are typically associated with mitochondria in eukaryotic cells, in prokaryotes, mesosomes take on this function.
- **Conclusion:** This statement is **true**.
### Final Conclusion
All four statements regarding mesosomes (A, B, C, and D) are true. Therefore, the correct answer is:
**Option 1: A, B, C, and D.**
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