COMEDK 2007 MCQ Answer 12

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The correct answer is B

Cytochrome oxidase (complex IV) carries out the following irreversible reaction:
O2 + 4 H+ + 4 e- ---> 2 H2O

Cyanide Blocks cytochrome oxidase (complex 4) and prevents both coupled and uncoupled respiration with all substrates, including NADH, succinate and ascorbate + TMPD.

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