Which of these is not a cell organelle ?

Options

A. Mitochondrion
B. Lysosome
C. Cell membrane
D. Golgi body

Answer

To determine which option is not a cell organelle, we can analyze the given options one by one:

1. **Mitochondria**:
- Mitochondria are known as the "powerhouse of the cell" because they produce energy in the form of ATP (adenosine triphosphate). They are indeed considered a cell organelle.

2. **Lysosomes**:
- Lysosomes are membrane-bound organelles that contain digestive enzymes. They are responsible for intracellular digestion, breaking down waste materials and cellular debris. Therefore, lysosomes are also classified as cell organelles.

3. **Cell Membrane**:
- The cell membrane is the outermost boundary of the cell. It serves as a protective barrier and regulates the movement of substances in and out of the cell. However, it is not considered an organelle because it does not perform specific functions like the other organelles do and is not located within the cytoplasm.

4. **Golgi Bodies**:
- Golgi bodies, or Golgi apparatus, are involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles. They are recognized as cell organelles.

Based on this analysis, the answer to the question "Which of these is not a cell organelle?" is the **Cell Membrane**.

### Step-by-Step Solution:
1. Identify the options given: Mitochondria, Lysosomes, Cell Membrane, Golgi Bodies.
2. Analyze each option to determine if it is a cell organelle.
3. Mitochondria produce energy and are organelles.
4. Lysosomes perform intracellular digestion and are organelles.
5. The Cell Membrane is the outer boundary of the cell and does not function as an organelle.
6. Golgi Bodies modify and package molecules and are organelles.
7. Conclude that the Cell Membrane is not a cell organelle.