The normal flow of electrons through the electron transport chain is blocked by sodium azide. Which of the following would you predict to occur upon addition of sodium azide to a cell? Halt in pyruvate oxidation and continuation in ATP synthesis Continuation in pyruvate oxidation and halt in ATP synthesis Halt in both pyruvate oxidation and ATP synthesis O Continuation in both pyruvate oxidation and ATP synthesis

The normal flow of electrons through the electron transport chain is blocked by sodium azide. Which of the following would you predict to occur upon addition of sodium azide to a cell? Halt in pyruvate oxidation and continuation in ATP synthesis Continuation in pyruvate oxidation and halt in ATP synthesis Halt in both pyruvate oxidation and ATP synthesis O Continuation in both pyruvate oxidation and ATP synthesis

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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Normally, the flow of electrons to O2 is tightlylinked to the production of ATP via the electrochemicalgradient. If ATP synthase is inhibited, for example, elec-trons do not flow down the electron-transport chain andrespiration ceases. Since the 1940s, several substances—such as 2,4-dinitrophenol—have been known to uncou-ple electron flow from ATP synthesis. Dinitrophenol wasonce prescribed as a diet drug to aid in weight loss. Howwould an uncoupler of oxidative phosphorylation pro-mote weight loss? Why do you suppose dinitrophenol isno longer prescribed?
Cyanide causes an irreversible inhibition of electron transport that prevents ATP synthesis, whereas the inhibitoryeffect of small amounts of dinitrophenol on ATP synthesisis reversible. Explain the difference.
Which of the following statements about oxidative phosphorylation is correct? O H+ ions are transferred from Complex I or Complex II to ATP synthase where ATP production occ O Proton pumps transfer electrons from the cytosol to the mitochondrial matrix as electrons are tra O The chemical and electrical gradient is established between the intermembrane space and the ma electron carriers. O ATP synthase pumps electrons back to the intermembrane space as a consequence of electrocher mitochondrial matrix. • Previous
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.
Which of the following statements concerning oxidative phosphorylation is false? Group of answer choices: The electron transport chain generates an electrochemical gradient that drives the production of ATP. ATP synthase with fewer subunits in its c ring will produce more ATP per proton. A “loose” β subunit of ATP synthase becomes a “tight” site as it produces ATP. When the supply of NADH and QH2 (ubiquinol) decreases, ATP synthase produces more ATP.
Cyanide poisoning inhibits aerobic respiration at cytochrome c oxidase. Which of the following is NOT a result of cyanide poisoning at the cellular level? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d e Oxygen is reduced to water The rate of glycolysis increases Cells are forced to switch to anaerobic respiration The electron transport chain is not completed None of the above Answered K Open in Reading View ✔Posubmit
Propose that you have discovered a new ATP synthase from the mitochondrion of an organism onthe planet X. You found that the mitochondrion from this newly discovered organism has exactly thesame electron transport chain as human beings. In addition, this newly discovered ATP synthase hassimilar subunit composition and arrangements as human beings, excepting that such newlydiscovered ATP synthase contain 6 c-subunits. Theoretically, the P/O ratio for the oxidation of FADH2 to water in this organism is: 1 1.5 2 2.5 3 3.5 None of the above Need more information Which statement is NOT true about the transport of ATP across the inner mitochondrial membraneon its way to the cytosol? The transport causes the loss of a net charge of -1 in the matrix. It is accomplished by adenine nucleotide translocase. The same enzyme that transports ATP also transport ADP in the opposite direction. It is complexed with Mg2+ to reduce the draw on the electrical part of the protonmotive force.
The oxidation of pyruvate produces carbon dioxide and water while liberating energy at a rate of 1142.2 kJ/mol. With the addition of electron transport, roughly 12.5 ATP molecules are created. The free energy required to hydrolyze ATP is 30.5 kJ/mol. What seems to be the apparent efficiency of ATP synthesis?
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Arsenate (AsO³-) closely resembles phosphate in structure and reactivity. However, arsenate esters are unstable and are spontaneously hydrolyzed. If arsenate is added to actively respiring mitochondria, what would be the effect on ATP synthesis? ATP synthesis will decrease because cells require less energy when arsenate is available. ATP synthesis will not be affected because mitochondria are incapable of taking up arsenate. ATP synthesis will stop due to the formation arsenate-ADP anhydrides. ATP synthesis will increase because arsenate anhydride hydrolysis increases ATP turnover. If arsenate is added to actively respiring mitochondria, what would be the most likely effect on the rate of the electron-transport chain? The rate of electron transport will decrease, because arsenate inhibits Complexes I and II. The rate of electron transport will decrease, because arsenate inhibits the citric acid cycle. The rate of electron transport will increase, because arsenate increases the demand…