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Question

Final electron acceptor in respiration is

A
Hydrogen
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B
Oxygen
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C
Cytochrome
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D
Dehydrogenase
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Solution

The correct option is B Oxygen
After the end of Krebs' cycle, final oxidation of reduced coenzymes occurs through ETS and oxidative phosphorylation. Each step in ETS involves release of 2H which dissociates into 2H+ and 2e-. The ETS consists of a series of coenzymes and cytochromes through which the protons and electrons pass. The final electron acceptor is oxygen in aerobic respiration.
So the correct answer is 'Oxygen'.

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