All of the following components of the mitochondrial electron transport chain contain several nitrogen atoms, with the exception of: A. the cytochrome b-cı complex B. the cytochrome c oxidase complex C. coenzyme Q (ubiquinone) D. the cytochrome a-a3 complex E. cytochrome c
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Q: mitochondrial matrix
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- In the Electron Transport Chain:(a). Upon the transfers, what is the final recipient of these electrons?(b). What is the compound obtained upon the completion of electron transportation?(c). What causes the changes in pH between the inner mitochondrial membrane during the electron transfer?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.Identify a metabolic pathway associated with the enzymes localized on the mitochondrial cristae. a. the citric acid cycle b. the electron transport chain c. the citric acid cycle and the electron transport chain d. none of these
- 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.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 is the major source of electrons that flow through the mitochondrial electron transport chain? (a) H2 0 (b) ATP (c) NADH (d) ATP synthase (e) coenzyme A
- The citric acid cycle generates NADH and FADH2, which are then used in the process of oxidative phosphorylation to make ATP. If the citric acid cycle (which does not use oxygen) and oxidative phosphorylation are separate processes, as they are, then why is it that the citric acid cycle stops almost immediately when O2 is removed?Release of cytochrome C from mitochondrial membrane is stimulated by which of the following (multiple answers)? A. Caspase 9 B. Bcl-W and Mcl-1 C. Bcl-2 and Bcl-XL D. BAX and BAD E. Bcl-2 aloneThe consumption of acetyl-CoA by the citric acid cycle is DECREASED under which condition? A. the concentration of NAD+ being high B. the concentration of oxaloacetate being high C. NADH being rapidly re-oxidized via the electron-transport chain D. the mitochondrial ATP synthase being inactive E. the concentration of both NAD+ and oxaloacetate being high
- You are given a suspension of purified mitochondria that are known to have adequate reserves of NAD+, FAD, and ADP/inorganic phosphate. Assume that the mitochondrial preparation you are working with is free of cytosolic components (enzymes and metabolites) and assume that all the compounds listed below can cross both mitochondrial membranes, When glucose is added to this suspension: a. What is the effect on oxygen consumption by the purified mitochondria? b. Explain your answer above. When citrate is added to this suspension: c. What is the effect on oxygen consumption by the purified mitochondria? d. Explain your answer above.Which of the following components of the mitochondrial electron transport chain is the only one to be considered a peripheral protein? the cytochrome a-a3 complex the cytochrome c oxidase complex coenzyme Q (ubiquinone) the cytochrome b-c1 complex cytochrome cWhich 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