A specialised differentiated form of cell membrane which is formed by infloding of cell membrane is called `ul(A)` in prokaryotic cell :

Options

A. Mesosomes
B. Mitochondria
C. Chloroplast
D. 70 S Ribosome

Answer

To solve the question regarding the specialized differentiated form of cell membrane formed by the infolding of the cell membrane in prokaryotic cells, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a specific term related to prokaryotic cells, describing a specialized form of cell membrane that is formed by the infolding of the cell membrane.

2. **Identify the Options**: The options provided are:
- Mesosomes
- Mitochondria
- Chloroplast
- 70S ribosome

3. **Analyze Each Option**:
- **Mitochondria**: These are organelles found in eukaryotic cells, known as the powerhouse of the cell, responsible for ATP synthesis. They are not present in prokaryotic cells.
- **Chloroplast**: These are also organelles found in plants and photosynthetic organisms, involved in photosynthesis. They are not found in prokaryotic cells.
- **70S Ribosome**: This is a type of ribosome found in prokaryotic cells, involved in protein synthesis, but it is not a specialized form of the cell membrane.
- **Mesosomes**: These are invaginated structures formed by the folding of the cell membrane in prokaryotic cells, specifically in gram-positive bacteria. They perform various functions such as respiration, secretion, increasing surface area for absorption, and supporting the cell wall.

4. **Conclude the Answer**: Based on the analysis, the correct answer is **mesosomes**.

### Final Answer:
The specialized differentiated form of cell membrane formed by the infolding of the cell membrane in prokaryotic cells is called **mesosomes**.