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  4. Last electron acceptor in respiration is

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Q. Last electron acceptor in respiration is

Uttarkhand PMTUttarkhand PMT 2008

Solution:

After the end of Krebs' cycle, final oxidation of reduced coenzymes occurs through ETS and oxidative phosphorylation. Each step in ETS involves release of $2 H$ which dissociates into $2 H +$ and $2 e -$. 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'.