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Question
In the electron transport system present in the inner mitochondrial membrane, complexes I and IV respectively are ______.
Options:
A .  NADH dehydrogenase and FADH2
B .  NADH2 and NADH dehydrogenase
C .  NADH dehydrogenase and cytochrome – c oxidase complex
D .  NADH dehydrogenase and ATP synthase
Answer: Option C
:
C
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-aanda3and two copper centres.

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