Which of the structures are found in photosynthetic prokaryotes ?
I. Mesosomes
II. Cellulose wall
III. Ribosomes
IV. Chloroplasts

Options

A. I,II,III and IV only
B. I, II and III only
C. I and III only
D. II and IV only

Answer

To solve the question regarding which structures are found in photosynthetic prokaryotes, we will analyze each of the given options one by one.

### Step-by-Step Solution:

1. **Understanding Prokaryotes**:
- Prokaryotes are simple, unicellular organisms that lack membrane-bound organelles. This is an important characteristic to keep in mind as we evaluate the structures listed.

2. **Analyzing Mesosomes**:
- Mesosomes are infoldings of the plasma membrane found in prokaryotic cells. They play a role in cell division and may also be involved in respiration.
- **Conclusion**: Mesosomes are found in photosynthetic prokaryotes. (Correct)

3. **Analyzing Cellulose Wall**:
- Cellulose is a polysaccharide that forms the cell wall in plants and some fungi. Prokaryotes, however, do not have a cellulose wall; instead, they have a peptidoglycan cell wall.
- **Conclusion**: Cellulose wall is not found in photosynthetic prokaryotes. (Incorrect)

4. **Analyzing Ribosomes**:
- Prokaryotes contain ribosomes, specifically the 70S type, which are essential for protein synthesis.
- **Conclusion**: Ribosomes are found in photosynthetic prokaryotes. (Correct)

5. **Analyzing Chloroplasts**:
- Chloroplasts are membrane-bound organelles found in eukaryotic cells that perform photosynthesis. Prokaryotes do not have chloroplasts; instead, they contain chlorophyll pigments that allow them to perform photosynthesis.
- **Conclusion**: Chloroplasts are not found in photosynthetic prokaryotes. (Incorrect)

### Final Answer:
Based on the analysis, the structures found in photosynthetic prokaryotes are:
- I. Mesosomes (Correct)
- III. Ribosomes (Correct)

Therefore, the correct answer is **C: 1 and 3 only**.