which of the follwing cell organelles is non-membrane bound and found in both prokaryotes and eukaryotes?

Options

A. Lysosomes
B. Ribosomes
C. Centrioles
D. Mitochondria

Answer

To answer the question of which cell organelle is non-membrane bound and found in both prokaryotes and eukaryotes, we can analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify a cell organelle that is both non-membrane bound and present in both prokaryotic and eukaryotic cells.

2. **Analyzing the Options**:
- **Lysosome**:
- Lysosomes are membrane-bound organelles that contain hydrolytic enzymes for digestion. They are not found in prokaryotes.
- **Conclusion**: This option is incorrect.

- **Ribosome**:
- Ribosomes are non-membrane bound organelles responsible for protein synthesis. They are present in both prokaryotes (70S ribosomes) and eukaryotes (80S ribosomes).
- **Conclusion**: This option is correct.

- **Centriole**:
- Centrioles are non-membrane bound organelles that are part of the cytoskeleton. However, they are only found in eukaryotic cells and not in prokaryotic cells.
- **Conclusion**: This option is incorrect.

- **Mitochondria**:
- Mitochondria are membrane-bound organelles known as the powerhouse of the cell. They are present only in eukaryotic cells and have a double membrane structure.
- **Conclusion**: This option is incorrect.

3. **Final Conclusion**:
- The only organelle that is non-membrane bound and found in both prokaryotes and eukaryotes is **ribosome**.

### Answer:
**Ribosome**