Practice Questions

TLS Online TPP Program

#Question id: 451

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

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?

#Unit 1. Molecules and their Interaction Relevant to Biology

Fumarate and succinate would become oxidized; FAD and FADH2 would become reduced.
Fumarate would become reduced, FADH2 would become oxidized.
No reaction would occur because all reactants and products are already at their standard concentrations.
Succinate would become oxidized, FAD would become reduced.

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