Of the following , which is not considered a membranous organelle ?

Options

A. lysosome
B. mitochondrion
C. ribosome
D. golgi body

Explanation

To solve the question "Of the following, which is not considered a membranous organelle?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Lysosomes
- B) Mitochondria
- C) Ribosomes
- D) Golgi bodies

2. **Analyze Lysosomes**:
- Lysosomes are membrane-bound organelles found in eukaryotic cells.
- They have a single membrane and contain hydrolytic enzymes for digestion and waste removal.
- **Conclusion**: Lysosomes are a membranous organelle.

3. **Analyze Mitochondria**:
- Mitochondria are also membrane-bound organelles.
- They have a double membrane structure and are known as the powerhouse of the cell because they generate ATP through aerobic respiration.
- **Conclusion**: Mitochondria are a membranous organelle.

4. **Analyze Ribosomes**:
- Ribosomes are unique because they are not membrane-bound.
- They can be found in both prokaryotic and eukaryotic cells, and they are involved in protein synthesis.
- In prokaryotes, ribosomes are 70S, while in eukaryotes, they are 80S.
- **Conclusion**: Ribosomes are NOT a membranous organelle.

5. **Analyze Golgi Bodies**:
- Golgi bodies (or Golgi apparatus) are membrane-bound organelles.
- They have a single membrane and are involved in the modification and packaging of proteins.
- **Conclusion**: Golgi bodies are a membranous organelle.

6. **Final Conclusion**:
- Among the options, the only one that is not considered a membranous organelle is **C) Ribosomes**.

### Answer:
C) Ribosomes