Which complex of the mitochondrial electron transport chain accepts electrons directly from NADH (the reduced form of nicotinamide adenine dinucleotide)? NADH dehydrogenase (complex I) FADH2 dehydrogenase (complex II) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complex Chapter 14, Pg. 78

Which complex of the mitochondrial electron transport chain accepts electrons directly from NADH (the reduced form of nicotinamide adenine dinucleotide)? NADH dehydrogenase (complex I) FADH2 dehydrogenase (complex II) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complex Chapter 14, Pg. 78

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter2: Cell Physiology

Section: Chapter Questions

Problem 10RE: Using the answer code on the right, indicate which form of energy production is being described: 1....

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What distinguishes the four complexes of the mitochondrial electron transfer system?
Which complex of the mitochondrial electron transport chain accepts electrons directly from NADH (the reduced form of nicotinamide adenine dinucleotide)? NADH dehydrogenase (complex I) FADH2 dehydrogenase (complex II) cytochrome b-c1 (complex III) cytochrome c oxidase (complex IV) the ATP synthase complex
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
Under typical conditions, how many protons are pumped across the mitochondrial intermembrane for each molecule of NADH that is oxidized (assuming its electrons are passed all the way to O2 by the respiratory chain)? 1. 1 2. 6 3. 10 4. 100
Which of the following dehydrogenases delivers electrons to directly to UQ in the electron transport pathway from the intermembrane space side of the inner mitochondrial membrane? a. succinate dehydrogenase b. acyl CoA dehydrogenase c. creatine kinase dehydrogenase d. glycerol-3-phosphate dehydrogenase
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
The glycerol phosphate shuttle moves reducing equivalents (electrons) from the cytosol to the mitochondrial matrix. Which of the following is not a feature of this shuttle? a) Cytoplasmic glycerol phosphate dehydrogenase converts dihydroxyacetone phosphate (DHAP) to glycerol-3-phosphate. b) Mitochondrial glycerol phosphate dehydrogenase converts glycerol-3-phosphate to DHAP. c) Cytoplasmic NADH is oxidized to NAD+. d) Mitochondrial NAD+ is reduced to NADH. e) 1.5 ATPs are formed per cytoplasmic NADH shuttled.
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.
All of the following components of the mitochondrial electron transport chain contain several nitrogen atoms, with the exception of: the cytochrome b-c1 complex the cytochrome c oxidase complex coenzyme Q (ubiquinone) the cytochrome a-a3 complex cytochrome c The most common enzyme in nature, used during the Calvin cycle, is called: ribulose bisphosphate carboxylase FADH2 dehydrogenase NADH dehydrogenase chlorophyll a chlorophyll b
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.
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.
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.