In aerobic organisms, the ultimate electron acceptor in the _____ of carbon fuels is _____.

Question

BlackTom AI · Accepted Answer

The question asks about the ultimate electron acceptor in the aerobic metabolism of carbon fuels, and it provides several paired phrases to fill in the blanks.
Option 1: 'oxidation; oxygen' — This is the correct pairing. In aerobic respiration, carbon fuels are oxidized, and the final electron acceptor is molecular oxygen, which accepts electrons at the end of the electron transport chain to form water.
Option 2: 'oxidation; water' — While water is a product of the electron transport chain when oxygen accepts electrons, water is not the ultimate electron acceptor itself; it is the product formed after oxygen accepts electrons. The phrase would misplace the role of water in the chain.
Option 3: 'reduction; oxygen' — The term 'reduction' does not describe the process of oxidizing carbon fuels in aerobic metabolism. The oxidation of substrates is the key process that transfers electrons to the electron transport chain, ending with oxygen as the acceptor.
Option 4: 'oxidation; NADH' — NADH is a high-energy electron donor that feeds electrons into the chain, not the ultimate acceptor. Therefore pairing oxidation with NADH as the final acceptor is incorrect.
Option 5: 'reduction; water' — This combines an incorrect process descriptor ('reduction') with an incorrect final acceptor and misidentifies water as the acceptor; neither aligns with aerobic respiration chemistry.
In summary, the mechanism involves the oxidation of carbon fuels and the transfer of electrons to oxygen in the final step of the electron transport chain, yielding water as a byproduct. The other options mix incorrect concepts about oxidizing vs reducing, and misidentify the roles of NADH and water within aerobic metabolism.

In aerobic organisms, the ultimate electron acceptor in the _ of carbon fuels is _.

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