Which is the final electron acceptor in respiration?
Correct answer: C. Oxygen
- A. Cytochromes
- B. Dehydrogenases
- C. Oxygen
- D. Hydrogen
Explanation
In aerobic respiration, oxygen functions as the final electron acceptor in the electron transport chain. Electrons are passed along the chain through various complexes and ultimately accepted by oxygen, forming water. This acceptance of electrons by oxygen is vital for establishing the proton gradient that drives ATP synthesis via chemiosmosis. The other options-cytochromes, dehydrogenases, and hydrogen-play roles in electron transfer or proton gradient formation but do not serve as the terminal electron acceptor.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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