For the standard redox potentials below, match each reaction with its standard r

Question

For the standard redox potentials below, match each reaction with its standard reduction potential, using only your knowledge of the electron transport chain.

Half Reactions                                                                            Standard Reduction Potential

NAD+ + 2H+ ?NADH                                                                         0.35

Cytochrome a3 (Fe3+) ? Cytochrome a3 (Fe2+)                             0.15

Rieske protein (oxidized) ? Rieske protein (reduced)                -.32

Cytochrome c (oxidized) ? Cytochrome c (reduced)            0.29

FMN (oxidized) ? FMNH2 (reduced)                                      -0.30

UQ ?UQH2                                                                                    0.816

1/2O2 +2H+ ? H2O                                                                      0.22

Cytochrome c1 (Fe3+) Cytochrome c1 (Fe2+)                              0.10

Cytochrome a (Fe3+) Cytochrome (Fe2+)                                  0.25

Explanation / Answer

The tendency of any chemical species to get reduced is called standard reduction potential. It is measured at standard conditions and expressed in volts. From the given information, some substances have positve values, while other substances have negative values. All the substances that have positive values have the tendency to be reduced. The more positve the potential, the more likely to be reduced, as it has greater affinity for electrons. Thus, NAD+, cytochrome a3, cytochrome C, UQ, and 1/2 O2 are ready to be reduced. Among all these, UQ (ubiquinone) has the greater tendency to get reduced.

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