객관식
Where do the reactions of the electron transport chain occur in eukaryotic cells?
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8. Respiration
Electron Transport Chain
객관식
In the electron transport chain, at which protein complex does oxygen accept electrons to form water?
A
Complex I (NADH: ubiquinone oxidoreductase)
B
Complex II (Succinate dehydrogenase)
C
Complex IV (Cytochrome c oxidase)
D
Complex III (Cytochrome bc\(_1\) complex)
검증된 단계별 안내1
Understand the role of the electron transport chain (ETC) in cellular respiration: The ETC is a series of protein complexes and electron carriers located in the inner mitochondrial membrane. Its primary function is to transfer electrons from electron donors (like NADH and FADH\(_2\)) to oxygen, the final electron acceptor, while pumping protons to create a proton gradient for ATP synthesis.
Identify the protein complexes involved in the ETC: The main complexes are Complex I (NADH: ubiquinone oxidoreductase), Complex II (Succinate dehydrogenase), Complex III (Cytochrome bc\(_1\) complex), and Complex IV (Cytochrome c oxidase). Each complex has a specific role in transferring electrons and contributing to the proton gradient.
Focus on the role of Complex IV (Cytochrome c oxidase): This is the final protein complex in the ETC. It receives electrons from cytochrome c and transfers them to molecular oxygen (O\(_2\)), reducing it to water (H\(_2\)O). This step is crucial because oxygen acts as the terminal electron acceptor.
Understand the chemical reaction at Complex IV: The reduction of oxygen involves the combination of electrons, protons, and oxygen molecules to form water. The reaction can be represented as: O\(_2\) + 4H\(^+\) + 4e\(^-\) → 2H\(_2\)O. This process is essential for maintaining the flow of electrons through the ETC.
Conclude that oxygen accepts electrons at Complex IV: Based on the structure and function of the ETC, oxygen is reduced to water specifically at Complex IV (Cytochrome c oxidase). This is the final step in the electron transport chain and is critical for aerobic respiration.
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