In the electron transport system present in the inner mitochondrial membrane, complexes I and IV respectively are ______.

NADH dehydrogenase and FADH₂

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NADH₂ and NADH dehydrogenase

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NADH dehydrogenase and cytochrome – c oxidase complex

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NADH dehydrogenase and ATP synthase

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Solution

The correct option is C NADH dehydrogenase and cytochrome – c oxidase complex
Complex 1 of electron transport chain (ETS) is NADH dehydrogenase, which oxidises NADH produced in the mitochondrial matrix during citric acid cycle. Complex IV of ETS refers to cytochrome oxidase complex containing cytochrome-a and a₃ and two copper centres.

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