Multiple Choice
Which of the following statements is true of most cellular redox reactions?
6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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Which molecule is the final electron acceptor in the electron transport chain?
A
Oxygen
B
Carbon dioxide
C
FADH2
D
NADH
Verified step by step guidance1
Understand the context: The electron transport chain (ETC) is a series of protein complexes located in the inner mitochondrial membrane that transfers electrons from electron donors to electron acceptors via redox reactions.
Identify the role of the final electron acceptor: In the ETC, the final electron acceptor is the molecule that receives electrons at the end of the chain, allowing the process to continue and ultimately produce ATP.
Consider the options: Oxygen, Carbon dioxide, FADH2, and NADH. Recall that FADH2 and NADH are electron carriers that donate electrons to the ETC, not acceptors.
Eliminate incorrect options: Carbon dioxide is not involved in the electron transport chain as an electron acceptor. It is a product of cellular respiration, specifically from the citric acid cycle.
Conclude with the correct answer: Oxygen is the final electron acceptor in the electron transport chain. It combines with electrons and protons to form water, completing the process.
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