The inhibition by an unknown inhibitor of electron transport was found to be removed by a large concentration of phenazine methosulfate. Since phenazine methosulfate is known to accept electrons from cytochrome b of complex III, which of the following is most similar to the unknown inhibitor?

Question

Quizplus · Accepted Answer

Antimycin A is the correct answer because it specifically inhibits electron transport at complex III by binding to cytochrome c reductase, which is similar to the effect of the unknown inhibitor that can be alleviated by phenazine methosulfate, a compound known to accept electrons from cytochrome b of complex III.

The Inhibition by an Unknown Inhibitor of Electron Transport Was