The first enzyme in the electron transport system is referred to as complex I,otherwise known as
A) ATP synthase.
B) NADH-ubiquinone oxidoreductase.
C) succinate dehydrogenase.
D) cytochrome c oxidase.

Question

Quizplus · Accepted Answer

The first enzyme in the electron transport system is NADH-ubiquinone oxidoreductase, also known as complex I. ATP synthase is not the first enzyme, but rather the final enzyme in the system that produces ATP. Succinate dehydrogenase is not part of complex I, but rather part of the citric acid cycle. Cytochrome c oxidase is the final enzyme in the electron transport system, not the first.

The First Enzyme in the Electron Transport System Is Referred