Which of the following accepts terminal electron during aerobic respiration ?

Options

A. Molecular `O_(2)`
B. Molecular `H_(2)`
C. Molecular `CO_(2)`
D. `NADPH_(2)`

Answer

**Step-by-Step Solution:**

1. **Understanding Aerobic Respiration**: Aerobic respiration is a process that requires oxygen to produce energy. It involves several stages, including glycolysis, the Krebs cycle, and the electron transport chain (ETC).

2. **Identifying the Role of Oxygen**: In aerobic respiration, oxygen is essential as it acts as the final electron acceptor in the electron transport chain. This means that after electrons are transferred through various complexes, they ultimately need to be accepted by a molecule to complete the process.

3. **Electron Transport Chain (ETC)**: The ETC consists of several complexes where electrons are passed along. The final complex in this chain is known as cytochrome oxidase, which includes cytochrome A and A3.

4. **Final Electron Acceptor**: At the end of the electron transport chain, the electrons are accepted by molecular oxygen (O2). This reaction results in the formation of water (H2O) as a byproduct.

5. **Conclusion**: Among the options provided (Molecular O2, Molecular H2, Molecular CO2, and NADPH2), the correct answer is **Molecular O2**, as it is the terminal electron acceptor during aerobic respiration.

**Final Answer**: Molecular O2

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