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Question

Which among the following membrane bound complexes in mitochondria is not a proton pump?

A
Cytochrome b and c
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B
Cytochrome c oxidase
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C
NADH dehydrogenase
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D
Succinate dehydrogenase
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Solution

The correct option is D Succinate dehydrogenase
A proton pump is an integral membrane protein pump that builds up a proton gradient across a biological membrane.

In mitochondria, the electron transport complexes I (NADH dehydrogenase), III (cytochrome bc1 complex), IV (cytochrome c oxidase) and V (ATP synthase) are proton pumps driven by electron transport but complex II which consists of succinate dehydrogenase is not a proton pump.

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