Phase 5: Spread of disease between humans is occurring in more than one country of one WHO region. Phase 6: Community-level outbreaks are in at least one additional country in a different WHO region from phase 5. A global pandemic is under way.
Figure %: The Electron Transport Chain. The events of the electron transport chain involve NADH and FADH, which act as electron transporters as they flow through the inner membrane space. In complex I, electrons are passed from NADH to the electron transport chain, where they flow through the remaining complexes. NADH is oxidized to NAD in this process.
Best Answer: D. The electron transport chain is composed of various proteins that act as electron acceptors and donors. As high-energy electrons pass through it, they release a little bit of their energy a time. This energy is used to pump H+ against a concentration gradient, increasing their concentration on one side.est Answer: D. The electron transport chain is composed of various proteins that act as electron acceptors and donors. As high-energy electrons pass through it, they release a little bit of their energy a time. This energy is used to pump H+ against a concentration gradient, increasing their concentration on one side.