Oxidation of NADH and FADH2 in the electron transport system are similar in that: (READ THESE ANSWER CHOICES CAREFULLY!) a Both give their electrons to Complex I. b Both give their electrons directly to Ubiquinone (CoQ). c Both require Ubiquinone, Complex III, Cytochrome C, and Complex IV, ultimately resulting in reduction of O2 d Both result in pumping of H+ from the intermembrane space to the mitochondrial matrix.

Oxidation of NADH and FADH2 in the electron transport system are similar in that: (READ THESE ANSWER CHOICES CAREFULLY!) a Both give their electrons to Complex I. b Both give their electrons directly to Ubiquinone (CoQ). c Both require Ubiquinone, Complex III, Cytochrome C, and Complex IV, ultimately resulting in reduction of O2 d Both result in pumping of H+ from the intermembrane space to the mitochondrial matrix.

Name: Oxidation of NADH and FADH2 in the electron transport system are simil
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Description: Oxidation of NADH and FADH2 in the electron transport system are similar in that: (READ THESE ANSWER CHOICES CAREFULLY!) aBoth give their electrons to Complex I. bBoth give their electrons directly to Ubiquinone (CoQ). cBoth require Ubiquinone, Compl

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter21: Photosynthesis

Section: Chapter Questions

Problem 5P: The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If...

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The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If noncyclic photosynthetic electron transport leads to the translocation of 7 H+/2e- and cyclic photosynthetic electron transport leads to the translocation of 2 H+/e-, what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation? (Assume that the CF1CF0-ATP synthase yields 3 ATP/14 H+.)
Given that malonate inhibits succinate dehydrogenase which of the following statements is TRUE? a. FADH2 results in only 4 H+ being pumped out of the mitochondrial matrix. b. All electron transport is inhibited. c. Transfer of electrons from NADH to Coenzyme Q (ubiquinone) is inhibited. d. Transfer of electrons from FADH2 to Coenzyme Q (ubiquinone) is inhibited. e. NADH results in only 4 H+ being pumped out of the mitochondrial matrix. Clear my choice
When the antibiotic X is added to actively respiring mitochondria, several things happen: the yield of ATP decreases, the rate of O2 consumption increases, heat is released, and the pH gradient across the inner mitochondrial membrane increases. Does X act as an uncoupler or an inhibitor of oxidative phosphorylation? Explain the experimental observations in terms of the antibiotic’s ability to transfer K+ ions across the inner mitochondrial membrane.
Which of the following statements concerning the complete oxidation of FADH2 in the electron transport chain is NOT true? a. In the final step, electrons from cytochrome c to O2 reducing it to H2O in complex IV, and four protons are transported from the intermembrane space to the matrix. b. In the first step, electrons from FADH2 are transferred in complex II to ubiquinone, which does not transport any proton across the inner mitochondrion membrane. c. In the second step, complex III transfers the electrons from ubiquinone to cytochrome c, and four protons are transported from the matrix to the intermembrane space. d. The complete oxidation of FADH2 causes transfer of 6 protons and yields two ATP.
NADH produced in the glycolytic pathway cannot enter the mitochondrial membrane, so the shuttle systems are utilized to deliver the electrons to the ETC. Using a flowchart, illustrate and differentiate the flow of the electrons in the ETC when electrons from cytosolic NADH are delivered to the ETC via the two shuttle systems.
Which of the following statements is true? A. The NADH dehydrogenase complex can pump more protons than can the cytochrome b-c1 complex. B. The pH in the mitochondrial matrix is higher than the pH in the intermembrane space. C. The proton concentration gradient and the membrane potential across the inner mitochondrial membrane tend to work against each other in driving protons from the intermembrane space into the matrix. D. The difference in proton concentration across the inner mitochondrial membrane has a much larger effect than the membrane potential on the total proton-motive force.
Which of the following statements is NOT true about the electron transport chain (ETC) and oxidative phosphorylation? A. Oxidative phosphorylation requires the enzyme complexes to be soluble in the mitochondrial matrix. B. If the proton gradient is too high, electrons will not move through the ETC. C. The movement of electrons down the ETC only happens if protons are pumped out of the mitochondrial matrix. D. Oxidative phosphorylation requires the mitochondrial intermembrane space to be more positively charged than the matrix. E. The free energy of the proton gradient can be used to create high energy bonds.
Which of the following statements is NOT true about the electron transport chain (ETC) and oxidative phosphorylation? (Only one answer applies) A. Oxidative phosphorylation requires the enzyme complexes to be soluble in the mitochondrial matrix. B. If the proton gradient is too high, electrons will not move through the ETC. C. The movement of electrons down the ETC only happens if protons are pumped out of the mitochondrial matrix. D. Oxidative phosphorylation requires the mitochondrial intermembrane space to be more positively charged than the matrix. E. The free energy of the proton gradient can be used to create high energy bonds.
An important function of the inner mitochondrial membrane is to provide a selectively permeable barrier to the movement of water soluble molecules and thus to generate different chemical environments on either side of the mem- brane. However, many of the substrates and products of oxidative phosphorylation are water soluble and must cross the inner membrane. How does this transport occur?
All of the following are shown in the Q cycle of the Complex III, except: a. That electrons are donated by QH2 b. That translocation of H+ occurs from the intermembrane space to the mitochondrial matrix c. That cytochrome c is the electron acceptor d. That electrons are transferred by cytochrome proteins and Fe-S clusters
During the FADH2 electron transport chain, the protons are pumped from the mitochondrial matrix to the intermembrane space through complexes CoQ/III, and IV the protons are pumped from the mitochondrial matrix to the intermembrane space through complexes I, CoQ/III, and IV the protons are pumped from the mitochondrial matrix to the intermembrane space through complexes I, CoQ/II, and IV the protons are pumped from the mitochondrial matrix to the outer mitochondrial membrane through complexes I, III, and IV
Which complex of the mitochondrial electron transport chain is the only one able to accept electrons directly from FADH2? NADH dehydrogenase (complex I) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complex FADH2 dehydrogenase (complex II) The above reaction (FADH2 donating its electrons to the electron transport chain) takes place in which of the following eukaryotic cell locations? the mitochondrial matrix the thylakoid membrane of chloroplasts the chloroplast stroma the inner mitochondrial membrane the cytoplasm

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	a	Both give their electrons to Complex I.
	b	Both give their electrons directly to Ubiquinone (CoQ).
	c	Both require Ubiquinone, Complex III, Cytochrome C, and Complex IV, ultimately resulting in reduction of O₂
	d	Both result in pumping of H⁺ from the intermembrane space to the mitochondrial matrix.