In the electron transport chain, the amount of ATP generated by electrons from an NADH molecule is more than the amount of ATP generated by electrons from an FADH2 molecule because: a There is more NADH than FADH2 made for every glucose molecule that enters cellular respiration. b One NADH contributes two electrons whereas one FADH2 contributes one electron to the electron transport chain. c With NADH, the final electron acceptor is complex I whereas with FADH2, the final electron acceptor is complex II. d More protons are pumped across the inner mitochondrial membrane when NADH is the electron donor than when FADH2 is the electron donor. e More H2O is produced when NADH is the electron donor than when FADH2 is the electron donor.
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The ETC uses these electrons to pump protons across the inner mitochondrial membrane, creating a proton gradient that drives ATP synthesis through oxidative phosphorylation. NADH donates its electrons to Complex I of the ETC, while FADH2 donates its electrons to Show more…
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NADH and FADH2 are both electron carriers that donate their electrons to the electron transport chain. The electrons ultimately reduce O2 to water in the final step of electron transport. However, the amount of ATP made by electrons from an NADH molecule is greater than the amount made by electrons from an FADH2 molecule. Why is more ATP made per molecule of NADH than per molecule of FADH2?
Adi S.
NADH and FADH2 are both electron carriers that donate their electrons to the electron transport chain. The electrons ultimately reduce O2 to water in the final step of electron transport. However, the amount of ATP made by electrons from an NADH molecule is greater than the amount made by electrons from an FADH2 molecule. Which statement best explains why more ATP is made per molecule of NADH than per molecule of FADH2? a) The H+ gradient made from electron transport using NADH is located in a different part of the mitochondrion than the H+ gradient made using FADH2. b)Fewer protons are pumped across the inner mitochondrial membrane when FADH2 is the electron donor than when NADH is the electron donor. c)It takes more energy to make ATP from ADP and Pi using FADH2 than using NADH. d)There is more NADH than FADH2 made for every glucose that enters cellular respiration. e)FADH2 is made only in the citric acid cycle while NADH is made in glycolysis, acetyl CoA formation, and the citric acid cycle.
A strong agent (such as NADH) is poised to donate electrons and has a negative reduction potential, whereas a strong oxidizing agent (such as O2) is ready to accept electrons and has a positive reduction potential. Electrons are transferred from NADH to O2 through a chain of three large protein complexes called the electron transport chain. The first large protein complex, called Complex I, contains the succinate dehydrogenase that generates FADH2 in the citric acid cycle. The electrons from NADH pump enough protons to generate ATP, whereas those from FADH2 yield molecules of ATP.
Ceyda G.
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