The Standard Reduction Potentials (E'°)for the Following Half Reactions Are $\rightarrow$

question 17

Multiple Choice

The standard reduction potentials (E'°) for the following half reactions are given.
Fumarate + 2H⁺ + 2e^- $\rightarrow$ succinate E'° = +0.031 V
FAD + 2H⁺ + 2e^- $\rightarrow$ FADH₂ E'° = -0.219 V
If you mixed succinate,fumarate,FAD,and FADH₂ together,all at l M concentrations and in the presence of succinate dehydrogenase,which of the following would happen initially?

• A)Fumarate and succinate would become oxidized;FAD and FADH₂ would become reduced.
• B)Fumarate would become reduced;FADH₂ would become oxidized.
• C)No reaction would occur because all reactants and products are already at their standard concentrations.
• D)Succinate would become oxidized;FAD would become reduced.
• E)Succinate would become oxidized;FADH₂ would be unchanged because it is a cofactor.

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