Electrons carried by NADH enter the electron transport system when they are transferred to:
| 1. | FMN | 2. | Ubiquinone | 
| 3. | Fe-S | 4. | FAD | 
ATP synthesis during oxidative phosphorylation in mitochondria is directly driven by:
| 1. | oxidation of glucose. | 
| 2. | electron transport downhill in the ETC. | 
| 3. | terminal transfer of electrons to oxygen. | 
| 4. | chemiosmosis. | 
| I: | Complex I is NADH dehydrogenase | 
| II: | Complex II is succinate dehydrogenase | 
| III: | Complex III is cytochrome b6f complex. | 
| A. | Final acceptor of electrons | 
| B. | Final acceptor of protons |