As we saw in Chapter 2, the reduction potential E for a partial reduction reaction
Oxidized molecule + e reduced molecule is a measure of the equilibrium constant of that partial reaction. With the exception of the b cytochromes in the CoQH2-cytochrome c reductase complex, the standard reduction potential E" of the carriers in the mitochondrial respiratory chain increases steadily from NADH to O2. For instance, for the partial reaction
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