The last or ultimate electron acceptor in electron-transport system is

Oxygen

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Cytochorme

a_{3}

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Cytochrome

b

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N A D P H_{2}

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Solution

The correct option is B Oxygen
ETS (electron transport system) is located in the inner mitochondrial membrane. Its main function is to release and utilize the energy stored in NADH + H $^{+}$ and FADH $_{2}$ . The last or ultimate electron acceptor in electron transport system is oxygen. It combines with hydrogen ion to form water.
Thus, the correct answer is option A.

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