Which one of following is complex V of the ETS of inner mitochondrial membrane?

Options

A. NADH Dehydrogenase
B. Cytochrome oxidase
C. Ubiquinone
D. ATP synthase

Answer

To solve the question regarding which one of the following is complex V of the electron transport system (ETS) of the inner mitochondrial membrane, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the ETS (Electron Transport System)**:
- The ETS, also known as the ETC (Electron Transport Chain), is a series of protein complexes located in the inner mitochondrial membrane. It plays a crucial role in cellular respiration by facilitating the transfer of electrons from electron donors to electron acceptors.

2. **Identify the Complexes**:
- The complexes of the ETS are numbered from I to V. Each complex has a specific role in the electron transport process.
- **Complex I**: NADH dehydrogenase
- **Complex II**: FADH2 dehydrogenase
- **Complex III**: Cytochrome bc1 complex
- **Complex IV**: Cytochrome c oxidase

3. **Determine Complex V**:
- After identifying the first four complexes, we need to find out what complex V is.
- **Complex V** is known as ATP synthase. This complex is responsible for synthesizing ATP from ADP and inorganic phosphate using the proton gradient generated by the previous complexes.

4. **Conclusion**:
- Based on the identification of the complexes, we conclude that the answer to the question is **ATP synthase**, which is complex V of the ETS.

### Final Answer:
- The correct answer is **ATP synthase** (Option 4).