For the conversion of succinate to fumarate, the standard reduction potentials (E'°) for the following half reactions are given.
Fumarate + 2H⁺ + 2e⁻ ⇌ succinate E'° = +0.031 V
FAD + 2H⁺ + 2e⁻ ⇌ FADH₂ E'° = –0.219 V
1)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.