During aerobic respiration, the passing on of the electrons removed as a part of the hydrogen atom to molecular `O_2` occurs in the……..

Options

A. Cytoplasm
B. Mitochondrial outer membrane
C. Mitochondrial inner membrane
D. Mitochondrial matrix

Answer

**Step-by-Step Solution:**

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

2. **Identifying the Role of Electrons**: During aerobic respiration, hydrogen atoms are removed from glucose. These hydrogen atoms are split into protons and electrons. The electrons are then transferred to molecular oxygen (O2) as part of the electron transport chain.

3. **Locating the Electron Transport Chain**: The electron transport chain is a series of protein complexes located in the inner membrane of the mitochondria. This is where the electrons are passed along a series of carriers, ultimately leading to the reduction of oxygen to water.

4. **Analyzing the Options**:
- **Cytoplasm**: This is where glycolysis occurs, not the electron transport chain.
- **Mitochondrial Outer Membrane**: This membrane does not participate in the electron transport process.
- **Mitochondrial Matrix**: This is where the Krebs cycle occurs, not the electron transport chain.
- **Mitochondrial Inner Membrane**: This is where the electron transport chain is located, making it the correct answer.

5. **Conclusion**: The passing on of the electrons removed as a part of the hydrogen atom to molecular oxygen occurs in the mitochondrial inner membrane.

**Final Answer**: Mitochondrial inner membrane (Option C).

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