The final electron acceptor of the electron transport chain that ...

Question

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is
a. oxygen.
b. water.
c. NAD+.
d. pyruvate.

Accepted Answer

Hello everyone. Our next question asks along with keamy osmosis, what is the other main energy source to generate large amounts of a TP during oxidative phosphor relation. Well we recall from our concept videos that oxidative phosphor elation is that last step in cellular respiration. It generates large amounts of ATP over 30 molecules of it. And it involves two things coupled together this electron transport chain involving the transfer of electrons from complex to complex, going down from a higher energy state to a lower energy state. Each time that transfer that energy is harvested to pump protons across the cell membrane against the concentration gradient. And bringing those protons up there creates this potential energy sort of like a battery. These elect these protons then flow through the other part of this process. The enzyme 80 P synthesis where that energy generated by them flowing downhill is harnessed by the A. T. P synthesis to generate A. T. P. From ADP and inorganic phosphate. So this second part with A T. P synthesis is the process of keamy osmosis. So since our question asks us, what is the other main energy source, we'll look at this first part the electron transport chain. And if we look at our answer choices, we see that answer. B is the redox reaction from the electron transport chain. And since electrons are being transferred from molecule to molecule there are redox reactions. So bee the redox reaction from the electron transport chain is the correct answer. Now if we want to be thorough and look back at our other answers and make sure we can eliminate them. A says the N A. D. H neglect analysis process. Well, N A. D. H is an electron carrier. It actually brings electrons to participate in this electron transport chain but it's not the main energy source. So we can eliminate a see says the piru molecules. Piru bait is generated by the cli colossus process earlier in this process it reduces N. A. D. Plus to become an A. D. H. And it becomes a Segal co A. And we recall that a seal. Coetzee then enters the Krebs cycle which will generate some 80 P. But not nearly as much as the A. T. P. That's generated here in oxidative phosphor relation. So again it's not even the main energy source. So we can eliminate choice C. And Joyce D. Says the redox reaction of piru beta oxidation and again, that does generate some energy it generates as N A. D. H. But it is not the main energy source. So we can eliminate choice D. Again, giving us answer be the redox reaction from the electron transport chain. See you in the next video

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