Terminal `e^(-)` acceptor of `e^(-)` transport is -

Options

A. `CO_(2)`
B. `C_(6)H_(12)O_(6)`
C. `H_(2)O`
D. `O_(2)`

Answer

### Step-by-Step Solution:

1. **Understanding the Electron Transport Chain (ETC)**:
- The electron transport chain is a series of complexes located in the inner mitochondrial membrane. It plays a crucial role in cellular respiration by transferring electrons derived from nutrients.

2. **Identifying the Role of the Terminal Electron Acceptor**:
- In the ETC, electrons are passed through various complexes (like cytochromes and iron-sulfur proteins) until they reach a terminal electron acceptor.

3. **Recognizing the Terminal Electron Acceptor**:
- The terminal electron acceptor is the molecule that receives the electrons at the end of the electron transport chain. In aerobic respiration, this is typically oxygen.

4. **Formation of Water**:
- When oxygen accepts electrons, it reacts with protons (hydrogen ions) to form water (H2O). This reaction is crucial as it helps maintain the flow of electrons through the chain.

5. **Conclusion**:
- Therefore, the terminal electron acceptor of the electron transport chain is oxygen.

### Final Answer:
The terminal electron acceptor of the electron transport chain is **oxygen**.

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