Q.

What is the primary role of oxygen in the electron transport system (ETS) of cellular respiration?

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a

It acts as the initial electron donor.

b

It serves as the final electron acceptor, forming water.

c

It directly synthesizes ATP from ADP and inorganic phosphate.

d

It generates a proton gradient across the outer mitochondrial membrane.

answer is B.

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Detailed Solution

During aerobic respiration, the role of oxygen is limited to the terminal stage of the process. Yet, the presence of oxygen is vital, since it drives the whole process by removing hydrogen from the system. Oxygen acts as the final hydrogen acceptor.

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What is the primary role of oxygen in the electron transport system (ETS) of cellular respiration?