In the electron transport chain there are 4 protein complexes and an ATP synthase. At which point does FADH2 enter into the system and provide electrons for the ATP generation process? Question 3Answer a. Complex 3 b. Complex 2 c. Complex 4 d. ATP synthase e. Complex 1
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FADH2 is a reduced coenzyme that carries electrons from the Krebs cycle to the ETC. Show more…
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electrons from FADH2 enter the electron transport chain through A) complex I B) complex II C) complex III D) complex IV E) A and B
Adi S.
1. The electrons involved in electron transport come from ______. (A) glycolysis (B) the pyruvate dehydrogenase complex (C) the citric acid cycle (D) all three processes 2. When NADH and FADH2 transfer their electrons to the electron transport chain, they are ______. (A) oxidized (B) epimerized (C) reduced (D) degraded 3. As electrons are transferred within complexes, ______ are transported out of the ______. (A) HCO3- ; outer mitochondrial membrane (C) H+ ; inner mitochondrial membrane (B) H+ ; outer mitochondrial membrane (D) ADP; inner mitochondrial membrane 4. NADH generated from glycolysis ______. (A) is transported as intact NADH into the mitochondria for electron transport (B) can be involved in the malate-aspartate shuttle so that reducing equivalents can be transported into the mitochondrion (C) is already in the mitochondrion because all glycolysis occurs in the mitochondrion. 5. How many protons are transported out of the inner mitochondrial membrane when two electrons are transported from NADH to Coenzyme Q through Complex I? (A) 0 (B) 1 (C) 2 (D) 4 (E) 6 6. How many protons are transported out of the inner mitochondrial membrane when two electrons are transported from FADH2 to Coenzyme Q through Complex II? (A) 0 (B) 1 (C) 2 (D) 4 (E) 6 7. At the end of electron transport, 4 electrons are transported from cytochrome C one at a time to and through Complex IV. From these 4 electrons, (i) how many protons are pulled from the mitochondrial matrix and (ii) how many are transferred through to the intermembrane space? (A) 2 & 2 (B) 4 & 2 (C) 4 & 4 (D) 8 & 4 (E) 8 & 8
Sri K.
7. When electrons are passed off from Complex III to Complex IV of the electron transport chain in mitochondria: a) The electrons gain a little energy as a result of being passed. b) The electrons are pumped across the inner convoluted membrane as a result of being passed. c) Both electrons and protons are pumped across the inner convoluted membrane as a result of being passed. d) Complex III received additional electrons from FADH2 once it passes those electrons. e) None of the above. 8. Consider Complex I and Complex IV of the electron transport chain of mitochondria. Which of the following is true? a) The electrons passed off by complex IV must have come from the same source as the electrons passed off by Complex I. b) The electrons given off by Complex I are of higher energy that the electrons passed off by Complex IV. c) Complex I passes its electrons to Complex II while Complex IV passes its electrons to O2. d) Complex I receives electrons from NADH or FADH2 while Complex IV receives its electrons from Complex III. e) There is more than one true statement above.
Dominador T.
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