The electron transport chain in cellular respiration is a series of reactions that generate a proton gradient across the inner mitochondrial membrane. What is the primary role of the proton gradient in ATP production? (a) It directly drives ATP synthesis through enzyme action (b) It creates a chemiosmotic force that powers ATP synthase (c) It provides energy for the transport of molecules across the membrane (d) It contributes to the maintenance of the mitochondrial membrane potential

The electron transport chain in cellular respiration is a series of reactions that generate a proton gradient across the inner mitochondrial membrane. What is the primary role of the proton gradient in ATP production? (a) It directly drives ATP synthesis through enzyme action (b) It creates a chemiosmotic force that powers ATP synthase (c) It provides energy for the transport of molecules across the membrane (d) It contributes to the maintenance of the mitochondrial membrane potential

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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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?
Although the outer mitochondrial membrane is permeable to all small molecules, the inner mitochondrial membrane is essentially impermeable in the absence of specific transport proteins. Consider this information answer: The ATP generated by oxidative respiration is used throughout the cell. The majority of ATP production occurs in the mitochondrial matrix. How do you think ATP is made accessible to enzymes in the cytosol and other organelles?
If isolated mitochondria are incubated with asource of electrons such as succinate, but without oxygen,electrons enter the respiratory chain, reducing each of theelectron carriers almost completely. When oxygen is thenintroduced, the carriers become oxidized at different rates(Figure Q14–1). How does this result allow you to order the electron carriers in the respiratory chain? What is theirorder?
(a) NAD+ kinase catalyzes the ATP-dependent conversion of NAD+ to NADP+. How many reducing equivalents are involved in this reaction? (b) How many reducing equivalents are involved in the conversion of ferric ion to ferrous ion? (c) How many reducing equivalents are involved in reducing one molecule of oxygen gas to water?
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 membrane
Predict the outcome of a mitochondrial membrane that is more permeable to hydrogen ions than normal. answer choices A.) Increased levels of inorganic phosphate in the mitochondrial matrix B.) Reduced formation of water C.) Reduced activity of electron transport chain D.) Increased activity of ATP synthase
What is the role of each of the following in the electron transport chain: (a) FADH 2; (b) ADP; (c) ATP synthase; (d) the inner mitochondrial membrane?
(a) NAD+ kinase catalyzes the ATP-dependent conversion of NAD* to NADP+. How many reducing equivalents are involved in this reaction? (b) How many reducing equivalents are involved in the conversion of ferric to ferrous ion? (c) How many reducing equivalents are involved in reducing one molecule of oxygen gas to water?
(a) Starting with one molecule of glucose, how many ATPs are produced during (I) aerobic and (II) anaerobic respiration? (b) In chemiosmotic (oxidative) phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP and what the driving force for the ATP formation through ATP synthase?
When pure reduced cytochrome c is added to carefully prepared mitochondria along with ADP, P, antimycin A, and oxygen, the cytochrome c becomes oxidized, and ATP is formed, with a P/o ratio approaching 1.0. (a) Indicate the probable flow of electrons in this system. (b) Why was antimycin A added? (c) What does this experiment tell you about the location of cou- pling sites for oxidative phosphorylation? (d) Write a balanced equation for the overall reaction (including cyt c oxidation and ATP synthesis).
Oxidative phosphorylation generates ATP using the reducing power of [ Select ] ["NADH, FADH2", "malate", "", ""] to move electrons down a series of carriers to ultimately produce a [ Select ] ["phosphate gradient", "proton gradient"] across the inner mitochondrial membrane, which is used by ATP synthase to make ATP. ATP synthase harnesses the energy stored in both [ Select ] ["charge and concentration gradients", "electrostatic and van der Waals interactions"] to achieve high energy phosphate bond synthesis. If the ion gradient across the inner membrane is dissipated by the expression of UCP1, ATP is not synthesized and [ Select ] ["heat is generated", "electron transport is blocked"] . The final electron acceptor in the electron transport chain is [ Select ] ["oxygen", "carbon dioxide"] with water as a product.
The glycerol-3-phosphate shuttle can transport cytosolic NADH equivalents into the mitochondrial matrix (see Fig. 15.11c). In this shuttle, the protons and electrons are donated to FAD, which is reduced to FADH₂. These protons and electrons are subsequently donated to coenzyme Q in the electron transport chain. End of Chapter Problem 86a How much ATP is generated per mole of glucose when the glycerol-3-phosphate shuttle is used? (Tolerance is +/- 2%) ATP are generated per glucose.