Although Embedded in the Membrane as an ETS Component, the Enzyme

Question

Although embedded in the membrane as an ETS component, the enzyme __________ does not pump protons.
A) pyruvate dehydrogenase
B) 2-oxoglutarate dehydrogenase
C) succinate dehydrogenase
D) malate dehydrogenase
E) glyceraldehyde dehydrogenase

Accepted Answer

Succinate dehydrogenase is the only enzyme among the given options that is embedded in the mitochondrial membrane as part of the electron transport chain but does not pump protons. It catalyzes the conversion of succinate to fumarate and transfers electrons directly to coenzyme Q.