Final answer:
NADH dehydrogenase (Complex I) receives electrons from NADH and succinate dehydrogenase (Complex II) receives electrons from FADH2. Both complexes are bound to the inner mitochondrial membrane, with the electrons from FADH2 bypassing Complex I, resulting in fewer ATPs being produced.
Step-by-step explanation:
The student's question pertains to the electron transport chain (ETC) in cellular respiration, specifically regarding the transfer of electrons from NADH and FADH2. The correct full answer is 'NADH dehydrogenase receives electrons from NADH in the ETC, while succinate reductase receives electrons from FADH2'.
NADH dehydrogenase, also known as Complex I, is a component of the ETC that is bound to the inner mitochondrial membrane. It starts the electron transport process by accepting electrons from NADH. These electrons are then passed to coenzyme Q (ubiquinone) which is reduced to QH2, a mobile electron carrier that delivers the electrons to Complex III.
On the other hand, succinate dehydrogenase is part of Complex II, which directly receives electrons from the oxidation of FADH2 to FAD during the citric acid cycle. This complex does not pass the electrons through Complex I but instead delivers them directly to ubiquinone, bypassing the proton pump of the first complex, leading to the production of fewer ATP molecules from the electrons of FADH2.