Choose the incorrect statement for electron transport system

Options

A. Enzyme complex-I accepts the elctrons and H^{+ ions
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 statement regarding the electron transport chain (ETC) and identify the incorrect one.

### Step-by-Step Solution:

1. **Understanding the Electron Transport System**:
- The electron transport system is a series of protein complexes and other molecules that transfer electrons from electron donors to electron acceptors via redox reactions. This process occurs in the inner mitochondrial membrane.

2. **Evaluating the Statements**:
- **Statement 1**: "The enzyme complex 1 accepts the electron H plus ions from the NADH."
- This statement is true. Complex 1, known as NADH dehydrogenase, indeed accepts electrons and protons from NADH produced in the Krebs cycle.

- **Statement 2**: "The cytochrome c is attached to the outer surface of the inner membrane."
- This statement is also true. Cytochrome c is located in the intermembrane space and is attached to the outer surface of the inner mitochondrial membrane.

- **Statement 3**: "The cytocomplex number 2 contains two copper centers."
- This statement is incorrect. Complex 2, known as succinate dehydrogenase, contains iron centers, not copper centers.

- **Statement 4**: "Complex number 5 is coupled to ATPase synthetase enzyme which has got a F0-F1 complex."
- This statement is true. Complex 5, known as ATP synthase, is indeed responsible for synthesizing ATP using the proton gradient created by the previous complexes.

3. **Identifying the Incorrect Statement**:
- After evaluating all the statements, it is clear that **Statement 3** is incorrect, as complex number 2 does not contain copper centers but iron centers.

### Final Answer:
The incorrect statement for the electron transport system is: **"The cytocomplex number 2 contains two copper centers."**

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