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Question

Which one of following is complex V of the ETS of inner mitochondrial membrane?

A
NADH dehydrogenase
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B
Cytochrome oxidase
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C
Ubiquinone
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D
Succinate dehydrogenase
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E
ATP synthase
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Solution

The correct option is E ATP synthase
Cofactors NADH and FADH2, generated during Glycolysis and Krebs cycle, donate their electrons to the electron transport system (complex I - complex IV) located on the inner membrane of the mitochondria and help create a proton gradient.
The complex V of ETS is the ATP synthase and it utilises the proton gradient created by the previous complexes of ETS to generate ATP.
ATP synthase contains a head piece, a stalk and a base piece. Out of these, the head piece is identified as the coupling factor 1 F1, stalk portion is necessary for binding F1 to inner mitochondrial membrane and the base piece is identified as F0 and present within the inner mitochondrial membrane.

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