Choose the incorrect statement for electron transport system

Options

A. Enzyme complex-I accepts te elctrons and 'H^+' from NADH
B. Cytochrome C is attached to the outer surface of inner membrane of mitochondria
C. Complex-II contains two copper centres
D. Complex-V is coupled to ATP synthase enzyme

Answer

To solve the question "Choose the incorrect statement for the electron transport system," we will analyze each option provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Understand the Electron Transport System (ETS)**:
- The ETS is a series of protein complexes located in the inner mitochondrial membrane. It plays a crucial role in cellular respiration by transferring electrons from electron donors to electron acceptors via redox reactions.

2. **Analyze Option 1**:
- **Statement**: "Enzyme complex 1 accepts the electrons and H plus ions from NADH."
- **Evaluation**: This statement is correct. Complex 1, also known as NADH dehydrogenase, indeed accepts electrons and protons (H+) from NADH, which is produced during the Krebs cycle.

3. **Analyze Option 2**:
- **Statement**: "Cytochrome c is attached to the outer surface of the inner membrane of mitochondria."
- **Evaluation**: This statement is incorrect. Cytochrome c is actually located on the inner surface of the inner mitochondrial membrane, not the outer surface.

4. **Analyze Option 3**:
- **Statement**: "Complex 2 contains two copper centers."
- **Evaluation**: This statement is incorrect. Complex 2, also known as succinate dehydrogenase, does not contain copper centers; instead, it contains iron centers.

5. **Analyze Option 4**:
- **Statement**: "Complex 5 is coupled to ATP synthase enzyme."
- **Evaluation**: This statement is correct. Complex 5 corresponds to ATP synthase, which is responsible for synthesizing ATP from ADP and inorganic phosphate.

6. **Conclusion**:
- The incorrect statements are Options 2 and 3. However, since the question asks for one incorrect statement, the most clearly incorrect statement is Option 2, as it misrepresents the location of cytochrome c.

### Final Answer:
The incorrect statement is: **"Cytochrome c is attached to the outer surface of the inner membrane of mitochondria."**