Which component of the electron transport chain transfers four protons?

Cytochrome-C oxidase

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CoQ Succinate reductase

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NADH-Q oxidoreductase

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Isocitrate dehydrogenase

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Solution

The correct option is C NADH-Q oxidoreductase
Electron transport chain consists of four large protein complexes as its major components:

Complex I - NADH CoQ Oxidoredutase - pumps 4 protons

Complex II - CoQ Succinate Reductase - does not pump protons

Complex III - CoQ Cytochrome c Oxidoreductase - pumps 4 protons

Complex IV - Cytochrome C Oxidase - pumps 2 protons

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