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- 1a. Name and draw diagrammatically the series of mitochondrial electron transfer catalysts, starting with the oxidation of NADH and succinate and ending with the reduction of O2. Indicate the sites and stoichiometry (per 2e) at which protons are translocated from the matrix to the intermembrane space. c. Indicate which complexes are inhibited by: amytal, antimycin A, azide (N3), cyanide (CN), carbon monoxide (CO), and rotenone. d. Describe the effects of (1) oligomycin and (2) uncouplers of oxidative phosphorylation, e.g., dinitrophenol (DNP), carbonyl cyanide-p- trifluoromethoxyphenylhydrazone (FCCP), on respiration and ATP synthesis when added to a suspension of mitochondria with excess malate, ADP, and inorganic phosphate (Pi). b. I1. Name and draw diagrammatically the series of mitochondrial electron transfer catalysts, starting with the oxidation of NADH and succinate and ending with the reduction of O2. 2. Indicate the sites and stoichiometry (per 2e) at which protons are translocated from the matrix to the intermembrane space. 3. Indicate which complexes are inhibited by: amytal, antimycin A, azide (N3 ), cyanide (CN), carbon monoxide (CO), and rotenone. 4. Describe the effects of (1) oligomycin and (2) uncouplers of oxidative phosphorylation, e.g., dinitrophenol (DNP), carbonyl cyanide-p- trifluoromethoxyphenylhydrazone (FCCP), on respiration and ATP synthesis when added to a suspension of mitochondria with excess malate, ADP, and inorganic phosphate (Pi).a) Make a theoretical calculation of how many ATP molecules can be formed from the breakdown of a molecule of Acetyl- CoA into carbon dioxide and water. The prerequisite is that the entire proton gradient across the mitochondrial inner membrane can be used for ATP production and that the ATP synthase has 6 c-subunits.
- The mitochondrial membrane potential is an indicator of cell viability. Think about mitochondrial function and decide which of these statements best describes the mitochondrial membrane potential. a.) A voltage that reflects the movement of ATP across the outer mitochondrial membrane b.) A voltage that reflects the movement of protons across the outer mitochondrial membrane c.) A voltage that reflects the movement of protons across the inner mitochondrial membrane d.) A voltage that reflects the movement of ATP across the inner mitochondrial membrane2B. Calculate the total number of ATP that will be generated from the complete B-oxidation of oncobic acid (CH:(CH,),CH=CH(CH,),COOH; 15:1 cis-A9) in an organism that has all the standard required enzymes for metabolism but which pumps only 2 H" in complex I, 0 H' in complex II, 2 H* in complex III and 4 H' in complex IV. The F,F, ATPase is composed of 3 a/ß subunits and 10 c subunits. Show all of your calculations. HOA. what cyclic pathway does this common metabolite enter? B. what are the reduced forms of NAD+ and FAD? What are the entry points for the reduced forms of NAD+ and FAD in the electron transport chain? C. what is the final electron acceptor in the electron transport chain?
- In oxidative phosphorylation.... 1. Succinate contributes 2e- to Complex II and 2H+ to the mitochondrial proton gradient. 2. NADH in the matrix passes 2 e- to coenzyme Q via Complex I. 3. Complexes I, II, III, and IV each contribute to the matrix proton gradient. 4. O2 stabilizes the catalytically active conformation of Complex V. 5. Reversible protonation of c subunits leads to rotation of the Complex V gamma subunit. 6. Each β subunit can bind ATP tightly under the right conditions. 7. For every 3 protons that pass across the inner mitochondrial membrane, 1 ATP is produced. Choose all options that are true.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 choiceD. REDUCING EQUIVALENTS FROM SUCCINATE ENTER THE MITOCHONDRIAL RESPIRATORY CHAIN AT (A) NAD (B) COENZYME Q (C) FAD (D) CYT C
- What is the major route for protons moving from the inter membrane space back into the mitochondrial matrix during oxidative phosphorylation? 1. Protons carried across the membrane by a molecule of dinitrophenol 2. Protons are transported along with ADP by the ATP/ADP translocase.3. Protons enter the half channel in subunit a facing the inter membrane space and exit via the half channel facing the mitochondrial matrix. Choose 1 correct answer explain? Give typing answer with explanation and conclusion15. In the ETC shown below, explain, IN YOUR OWN WORDS, what is occurring at the different stages labeled. a. b. C. d. e. Electron transport chain ATP synthase Intermembrane space Inner mitochondrial- membrane NADH A (H+ NAD + H+ Mitochondrial matrix B H+ H+ (H+ FADH₂ FAD+ H+ (H+ (H+ 2 free 2 electrons hydrogen exiting ETC ions C H+ H+ 1/2 of an O₂ molecule (H+ H+ (H+ (H+ H₂O x 2 H ADP PO (H (H+ D E ATP. In the section dealing with “NAD+ in disease” it is mentioned that metabolomics results indicate that impaired mitochondrial function contributes to some of the mentioned diseases. Which metabolites can potentially accumulate when complex I of the electron transport chain is defective? Use Fig 1 for guidance.