객관식
Which component of the electron transport chain is primarily responsible for transferring electrons from NADH to ubiquinone (coenzyme Q)?
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8. Respiration
Electron Transport Chain
객관식
Which molecule serves as the final electron acceptor in the electron transport chain of cellular respiration?
A
Oxygen (\(O_2\))
B
Carbon dioxide (\(CO_2\))
C
NAD\(^+\)
D
Glucose
검증된 단계별 안내1
Understand the concept of the electron transport chain (ETC): The ETC is the final stage of cellular respiration, occurring in the inner mitochondrial membrane. It involves a series of protein complexes and electron carriers that transfer electrons to generate a proton gradient, ultimately producing ATP.
Identify the role of the final electron acceptor: In the ETC, electrons are passed down the chain through various carriers. At the end of the chain, these electrons need to be accepted by a molecule to prevent the chain from halting.
Recall the chemistry of oxygen (\(O_2\)): Oxygen is highly electronegative, meaning it has a strong tendency to attract electrons. This property makes it an ideal final electron acceptor in the ETC.
Understand the reaction involving oxygen: Oxygen (\(O_2\)) combines with electrons and protons (H\(^+\)) at the end of the ETC to form water (H\(_2\)O). This reaction is crucial for maintaining the flow of electrons through the chain.
Eliminate incorrect options: Carbon dioxide (\(CO_2\)) is a waste product of cellular respiration, NAD\(^+\) is an electron carrier, and glucose is the initial substrate for cellular respiration. None of these serve as the final electron acceptor in the ETC.
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