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Which of the following is not involved in electron chain transport system?

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Which of the following is not involved in electron chain transport system?

(a) Complexes I, II, II, IV

(b) Ubiquinone

(c) Cytochrome C

(d) All of them are involved

I had been asked this question during an online exam.

My question is based upon Mitochondrial Structure and Function in portion Mitochondrial Structure and Function of Cell Biology

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Right choice is (d) All of them are involved

To explain I would say: Electron carriers can be isolated as part of four distinct, asymmetric, membrane-spanning complexes known as complexes I, II, II and IV. Two of the electron transport chain complexes, Ubiquinone and Cytochrome C are not part of any complexes. Ubiquinone is present as a pool of molecules dissolved in lipid bilayer and Cyt C is soluble protein in intermembrane space.

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