Enzymes of oxidative phosphorylation occur in

Options

A. Endoplasmic reticulum
B. Chloroplasts
C. Mitochondria
D. Golgi apparatus.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the enzymes of oxidative phosphorylation occur. We need to identify the correct organelle from the given options: endoplasmic reticulum, chloroplast, mitochondria, and Golgi apparatus.

2. **Identifying the Process**: Oxidative phosphorylation is a key metabolic process that involves the transfer of electrons from electron donors to electron acceptors. This process is crucial for ATP production in cells.

3. **Locating the Enzymes**: The enzymes responsible for oxidative phosphorylation are located in the inner membrane of mitochondria. This membrane is less permeable and is specifically designed to facilitate the electron transport chain and ATP synthesis.

4. **Eliminating Incorrect Options**:
- **Endoplasmic Reticulum**: This organelle is involved in protein and lipid synthesis, not oxidative phosphorylation.
- **Chloroplast**: While chloroplasts are involved in photosynthesis, they do not participate in oxidative phosphorylation.
- **Golgi Apparatus**: This organelle is responsible for modifying, sorting, and packaging proteins, not for oxidative phosphorylation.

5. **Conclusion**: Since the enzymes of oxidative phosphorylation are specifically located in the mitochondria, the correct answer is "mitochondria."

**Final Answer**: The enzymes of oxidative phosphorylation occur in the mitochondria.

---