Carbon monoxide is considered toxic because it acts on Complex IV. How would the addition of carbon monoxide to activelyrespiring mitochondria affect the relative oxidation-reduction states of all components of the electron-transport chain?Complexes I and I would be reduced, but complexes II and IV would be oxidized because the electrons come from FADH2 oxidation, notNADH.O All four complexes would remain oxidized because they function as a multisystem complex.O Complexes I, II, and I would be reduced and Complex IV would be oxidized.All four complexes would remain reduced because they function as a multisystem complexComplexes I, II, and ill would be oxidized but Complex IV would remain reduced.

The answer is the 3rd option: Complex I, II, and III would be reduced and complex IV would be…

Answered: Carbon monoxide is considered toxic…

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...

See similar textbooks

Similar questions

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+.)
Referring to the figure below, explain why NADH yields more ATP than FADH2 does. Electron-transport and proton pump Oxidative phosphorylation Outer mitochondrial membrane H* -Intermembrane H+ H+ H+ space H* H+ H+ Cytochrome c H+ COQH, CoQ UU COQH2 CoQ JU U Inner mitochondrial membrane Ht e ATPase Complex II Complex II Complex IV Complex e ADP +P - Mitochondrial matrix NADH NAD+ FADH2 FAD АТР H+ -H+ H+ H20
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.
The TCA cycle enzyme aconitase and the electron transport proteins have chromophores that absorb in the visible part of the spectrum, and therefore mitochondria have a dark brown color. In contrast, none of the glycolytic enzymes have visible spectrum chromophores. Which of the following statements is true? Question 3 Select one: a. Migrating birds, such as ducks have “white” breast meat, because flying long distances requires anaerobic ATP generation. d. The leg muscle of turkeys is specialized for anaerobic ATP generation via glycolysis. e. The flight muscle of turkeys is specialized for anaerobic ATP generation via glycolysis. f. None of the answers are correct.
For the Complex III in the electron transport chain: Complex III step 1: UQH2 is oxidized in a 2 electron process. Cytochrome c is reduced and UQ is reduced to UQH in two 1 electron processes. Complex III step 2: UQH2 is oxidized in a 2 electron process. Cytochrome c is reduced and UQH is reduced to UQH2 in two 1 electron processes. The necessary standard reduction potentials are: UQ + 2H+ + 2e- UQH2 E° = 0.06 V cyt c (Fe3+) + e- cyt c (Fe2+) E° = 0.254 V UQ + H+ + e- UQH. E° = 0.03 V UQH. + H+ + e- UQH2 E° = 0.19 V Calculate the total redox potential of the complex. Now calculate how many moles of protons can be translocated across the inner mitochondrial membrane if translocation of 1 mole requires 23 kJ. Calculate the free energy available for proton translocation assuming a 2electron process for each complex.
What is the total number of H+ transferred from matrix to intermembrane space of the mitochondria by complexes I, II and III for every 2 electrons movement? What would be the total amount of ATP synthesized (explain)?
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.
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.
A poison that prevents the transfer of electrons from the last [Fe-S] cluster of Complex I to coenzyme Q is added to a suspension of actively respiring mitochondria. Which of the following will be observed? ATP production would be impaired due to the uncoupling of oxidative phosphorylation from electron transport. ATP production would be reduced due to inhibition of the CoQ subunit of ATP synthase. ATP production would be reduced due to a decrease in the number of protons pumped out of the mitochondrial matrix. ATP production would be halted completely due to the block in electron transport through the electron transport chain.
To carefully prepared mitochondria were added succinate, oxidized cytochrome c, ADP, orthophosphate, and sodium cyanide. The overall balanced equation is: succinate + 2 cyt c(ox) + ADP + Pi --> fumarate + 2 cyt c(red) + ATP + H2O The standard state free energy of this system is O -10.3 kJ/mol 42.5 kJ/mol O 10.3 kJ/mol -42.5 kJ/mol
Two biochemistry students are about to usemitochondria isolated from rat liver for an experiment on oxidative phosphorylation. The directions for the experiment specifyaddition of purified cytochrome c from any source to the reactionmixture. Why is the added cytochrome c needed? Why does thesource not have to be the same as that of the mitochondria?
If actively respiring mitochondria are exposed to an inhibitor of ATPADP translocase, the electrontransport chain ceases to operate. Why?

SEE MORE QUESTIONS

Recommended textbooks for you

Biochemistry

ISBN:

9781305577206

Author:

Reginald H. Garrett, Charles M. Grisham

Publisher:

Cengage Learning

Biology: The Dynamic Science (MindTap Course List)

Biology

ISBN:

9781305389892

Author:

Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:

Cengage Learning

Biochemistry

ISBN:

9781305577206

Author:

Reginald H. Garrett, Charles M. Grisham

Publisher:

Cengage Learning

Biology: The Dynamic Science (MindTap Course List)

Biology

ISBN:

9781305389892

Author:

Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS