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Figure 12.6. Coenzyme Q carries two hydrogen atoms.

The second electron carrier is a small protein found in the mitochondrial intermembrane space called cytochrome c. It has a relative molecular mass of 12,270, which is just large enough to be retained by the mitochondrion (the channel porin in the outer membrane passes solute of Mr = 10, 000 or less). Cytochrome c is soluble but associates with the inner mitochondrial membrane.

We have said that oxidation is loss of electrons, and reduction gain of electrons. Electron carriers that cycle between the reduced state and the oxidized state normally move either one

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