D. is a normal eukaryotic organism. B. transfer of phosphate to ADP. During aerobic respiration, molecular oxygen (O2) is used for which of the following purposes? C. oxidized A. NADH reactions to reform ATP. B. citrate In mitochondrial electron transport, what is the direct role of O2? Which statement is NOT true about standard electrode potentials? When the NAD+ bonds with a hydrogen the electrons are hogged by the very negative atoms like when Sal was talking about glucose. A. 0% Is the action/movement of ATP synthase passive or active? Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule? Yes, further apart orbitals are associated with higher energy levels. If you look in different books, or ask different professors, you'll probably get slightly different answers. What do you note, qualitatively, about the relative volumes and masses of steam and liquid water required to release the same amount of heat? D. It was converted to heat and then released. The citric acid cycle serves as the mitochondrial hub for the final steps in carbon skeleton oxidative catabolism for carbohydrates, amino acids, and fatty acids. D. reduced, and energy is released. Electron carriers. d. are coupled via phosphorylated intermediates to endergonic processes. Direct link to Sydney Brown's post Is the action/movement of, Posted 4 years ago. A. Pyruvate + NADH + H+ Lactate + NAD+ B. acetyl CoA, NADH, and CO2 A. Hydrogen, polar. The electrons gain free energy. How much H2O is produced is the electron transport chain? A. provide the energy that establishes the proton gradient. The three listed steps result in the formation of _____. E. are the source of energy driving prokaryotic ATP synthesis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation. In chemiosmosis, the energy stored in the gradient is used to make ATP. Most of the CO2 from the catabolism of glucose is released during _____. I get that oxygen serves as an electron acceptor at the end of the electron transport chain, but why is having this electron acceptor so important? A. A. (D) are coupled via phosphorylated intermediates to endergonic processes. b. provide the energy that establishes the proton gradient. Inner Membrane of the Mitochondria Show that 12if(z)f(z)dz=ZP.\frac{1}{2 \pi i} \oint_{\gamma} \frac{f^{\prime}(z)}{f(z)} d z=Z-P.2i1f(z)f(z)dz=ZP. D. ATP is consumed, and oxygen is produced. glucose is phosphorylated before it is split into two three-carbon molecules. D. 4. It would be released as heat, and interestingly enough, some types of cells deliberately use the proton gradient for heat generation rather than ATP synthesis. The oxidation of NADH is directly coupled to the reduction of oxygen to water. A. two molecules of ATP are used and two molecules of ATP are produced. If you block the exit, the flow through the entire pipeline stalls and nothing moves. In mitochondria, exergonic redox reactions provide the energy that establishes the proton gradient. B. start text, C, end text, start subscript, 6, end subscript, start text, H, end text, start subscript, 12, end subscript, start text, O, end text, start subscript, 6, end subscript, 6, start text, O, end text, start subscript, 2, end subscript, 6, start text, C, O, end text, start subscript, 2, end subscript, 6, start text, H, end text, start subscript, 2, end subscript, start text, O, end text, delta, G, equals, minus, 686, start text, k, c, a, l, slash, m, o, l, end text, start text, H, end text, start superscript, plus, end superscript, start text, start color #6495ed, N, A, D, end color #6495ed, end text, start superscript, plus, end superscript, 2, start text, e, end text, start superscript, minus, end superscript, 2, start text, start color #9d38bd, H, end color #9d38bd, end text, start superscript, plus, end superscript, start text, start color #6495ed, N, A, D, end color #6495ed, end text, start text, start color #9d38bd, H, end color #9d38bd, end text, start text, space, start color #9d38bd, H, end color #9d38bd, end text, start superscript, plus, end superscript, start text, start color #28ae7b, F, A, D, end color #28ae7b, end text, 2, start text, start color #9d38bd, space, H, end color #9d38bd, end text, start superscript, plus, end superscript, start text, start color #28ae7b, F, A, D, end color #28ae7b, start color #9d38bd, H, end color #9d38bd, end text, start subscript, start color #9d38bd, 2, end color #9d38bd, end subscript, start text, start color #9d38bd, H, end color #9d38bd, end text, start superscript, plus, end superscript, start text, M, g, end text, plus, start text, C, l, end text, start subscript, 2, end subscript, right arrow, start text, M, g, end text, start superscript, 2, plus, end superscript, plus, 2, start text, C, l, end text, start superscript, minus, end superscript, start text, H, end text, start subscript, 2, end subscript, start text, O, end text, start subscript, 2, end subscript, start text, H, end text, start subscript, 2, end subscript, start text, O, end text, start text, O, end text, minus, start text, H, end text, start text, C, comma, space, O, comma, space, N, comma, end text, , G, equals, minus, 686, start text, k, c, a, l, slash, m, o, l, end text, start text, e, n, e, r, g, y, !, end text, What is the difference between nadph and nadH. In glycolysis, for each molecule of glucose oxidized to pyruvate _____. 18-24 Direct link to kevinoconnell12's post Is NAD+/NADH primarily in, Posted 7 years ago. Substrate-level vs. oxidative phosphorylation. D. mitochondrial matrix, During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level? Most CO2 from catabolism is released during. B. four molecules of ATP are used and two molecules of ATP are produced. A. NAD+ has more chemical energy than NADH. C. are coupled via phosphorylated intermediates to endergonic processes. C. Oxygen, nonpolar. Oxygen participates directly in the reaction that makes ATP from ADP and P. Which of the following statements accurately describes the function of a metabolic pathway involved in cellular respiration? D. act as an acceptor for electrons and hydrogen, forming water, During aerobic respiration, H2O is formed. The electrons are passed from enzyme to enzyme through a series of redox reactions. A hydrogen atom is transferred to the atom that loses an electron. An electron transport chain, or ETC, is composed of a group of protein complexes in and around a membrane that help energetically couple a series of exergonic/spontaneous red/ox reactions to the endergonic pumping of protons across the membrane to generate an electrochemical gradient.This electrochemical gradient creates a free energy potential that is termed a . In eukaryotes, this step takes place in the matrix, the innermost compartment of mitochondria. E. transforming the energy in glucose and related molecules in a chemical form that cells can use for work. In recent years, astronomers have found planets orbiting nearby stars that are quite different from planets in our solar system. The key steps of . High-energy electrons derived from food traverse the mitochondrial electron transport chain in a series of exergonic redox reactions. Direct link to alisonkershaw56's post Definitely happens in mat, Posted 7 years ago. A. only eukaryotic cells, in the presence of oxygen In the electron transport chain, electrons are passed from one molecule to another, and energy released in these electron transfers is used to form an electrochemical gradient. The combination of the citric acid cycle and electron transport. Muscle tissues make lactate from pyruvate to do which of the following? Not that I know of. A. mitochondrial intermembrane space This trick lets us use the gain or loss of, On the other hand, if a carbon-containing molecule loses. B. active transport NADH and FADH2 shuttle high energy electrons extracted from food during glycolysis and the Krebs cycle into an electron transport chain built into the inner mitochondrial membrane. C. pyruvate How can you go about this? Direct link to Peony's post well, seems like scientis, Posted 7 years ago. are coupled via phosphorylated intermediates to endergonic processes. For instance, some intermediates from cellular respiration may be siphoned off by the cell and used in other biosynthetic pathways, reducing the number of ATP produced. A jet touches down on a runway with a speed of 142.4mph142.4 \mathrm{mph}142.4mph. Direct link to Richard Wu's post Hm. A cell stays small, Posted 7 years ago. b. provide the energy that establishes the proton gradient. B. What does this mean for your table on the 'breakdown of one molecule of glucose'? Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule? B. It was used until 1938 as a weight-loss drug. A. CO2 is reduced and O2 is oxidized. B. Polar and nonpolar. D. reduce FADH2 to FAD+, An organism is discovered that thrives in both the presence and absence of oxygen in the air. Simplified diagram showing oxidative phosphorylation and substrate-level phosphorylation during glucose breakdown reactions. D. No external source of energy is required because the reaction is exergonic. Direct link to isaac22perez22's post The process of oxidative , Posted 6 years ago. Simple diagram of the electron transport chain. In mitochondria, exergonic redox reactions a. are the source of energy driving prokaryotic ATP synthesis b. are directly coupled to substrate-level phosphorylation c. provide the energy to establish the proton gradient d. reduce carbon atoms to carbon dioxide e. are coupled via phosphorylated intermediates to endergonic processes Are directly coupled to substrate-level phosphorylation. We'll look more closely at both the electron transport chain and chemiosmosis in the sections below. What general key things do I need to know for each step of the Krebs cycle? B. Catabolic processes are activated that generate more ATP. Instead, it must hand its electrons off to a molecular shuttle system that delivers them, through a series of steps, to the electron transport chain. (explain). Kepler-39b, has a diameter that is 1.2 times that of Jupiter, but a mass that is 18 times that of Jupiter. What does substrate level phosphorylation means? B. the breakdown of glucose into two pyruvate molecules The individual reactions can't know where a particular "proton" came from. Energy released by the electron transport chain is used to pump H+ into which location in eukaryotic cells? Which of the following events takes place in the electron transport chain? 2/3 When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____. The function of the citric acid cycle is the transfer of electrons from pyruvate to NADH to O2. This is the same for FAD I think because it's made up primarily of those electronegative atoms. C. Oxygen is consumed, and glucose is produced. The steps above are carried out by a large enzyme complex called the. The individual's ATP production will not change significantly. (C) reduce carbon atoms to carbon dioxide. D. acetyl CoA, NAD+, ATP, and CO2, Which one of the following is formed by the removal of a carbon (as CO2) from a molecule of pyruvate? Energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. At the same time, electrons are transported from intermediates of the glucose breakdown reactions to the electron transport chain by electron carriers. Which terms describe two atoms when they form a bond in which electrons are completely transferred from one atom to the other? B. mitochondrial outer membrane Where do the hydrogens go? This process of electron transport, proton pumping, and capture of energy from the proton gradient to make ATP is called oxidative phosphorylation. Direct link to Niamh Henderson's post usually the enzymes and i, Posted 7 years ago. A carboxyl group is removed from pyruvate and released as carbon dioxide. Direct link to YAYAA's post What is the difference be, Posted 7 years ago. The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is Oxidation of glucose to pyruvate; oxidation of pyruvate; oxidation of acetyl-coA; oxidative phosphorylation. E. The cytochromes phosphorylate ADP to form ATP. In the next articles and videos, we'll walk through cellular respiration step by step, seeing how the energy released in redox transfers is captured as ATP. In the combined processes of glycolysis and cellular respiration, what is consumed and what is produced? Many more steps, however, produce ATP in an indirect way. Then it joins with Oxaloacetate to get into citrate cycle. are the source of energy driving prokaryotic ATP synthesis reduce carbon atoms to carbon dioxide provide the energy that establishes the proton gradient reduce lactate to pyruvate ATP is produced in the Krebs's cycle by Each oxidative step, in turn, reduces a coenzyme such as nicotinamide adenine dinucleotide (NADH) or flavin adenine dinucleotide (FADH2). It occurs in the mitochondria. D. a reaction with a positive G. Vesicles are packages. D. Oxygen acts as the electron acceptor and is oxidized. What purpose must this serve? Where does Electron Transport Chain occur and what is it mainly made of? D. ADP + i, The primary role of oxygen in cellular respiration is to _____. D. acetyl-CoA, Which electron carrier(s) function in the citric acid cycle? What is the role of vesicles in transportation of materials in the cells?? Where did all the hydrogen ions come from? B. ADP and ATP But have you ever wondered why thats the case, or what exactly your body does with all that oxygen? What organelle is indicated by the letter C? C. two molecules of ATP are used and four molecules of ATP are produced. In mitochondrial electron transport, what is the direct role of O2? Transfer of a phosphate group from a fragment of glucose to ADP by substrate-level phosphorylation. The function of glycolysis is to begin catabolism by breaking glucose into two molecules of pyruvate, with a net yield of two ATP. What kind of bond is formed when lithium and fluorine combine to form lithium fluoride? If you're seeing this message, it means we're having trouble loading external resources on our website. Does the formation of H20 release ATP as a by product that is then regenerated? When. b. E. pyruvate. As electrons move energetically downhill, the complexes capture the released energy and use it to pump H, Like many other ions, protons can't pass directly through the phospholipid bilayer of the membrane because its core is too hydrophobic. If NADH becomes NAD+, it releases H+ and if FADH2 becomes FAD and would release 2H+. (B) provide the energy that establishes the proton gradient. B. In short I understand that the cell in this case (h+) uses an enzyme (atp synthase, coupled?) Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule? As you know if youve ever tried to hold your breath for too long, lack of oxygen can make you feel dizzy or even black out, and prolonged lack of oxygen can even cause death. B. the citric acid cycle In the brown fat cells, How many ATP do we get per glucose in cellular respiration? This step regenerates NAD+ and FAD (the oxidized carriers) for use in the citric acid cycle. B. glucose (C6H12O6) Gaseous hydrogen burns in the presence of oxygen to form water: However it shows no hydrogen in the carboxyl group. Cellular respiration and breathing differ in that cellular respiration is at the cellular level, whereas breathing is at the organismal level. This is because glycolysis happens in the cytosol, and NADH can't cross the inner mitochondrial membrane to deliver its electrons to complex I. Direct link to SanteeAlexander's post I thought it was 38 ATPs , Posted 6 years ago. E. It is stored in pyruvate. B. Redox. All of the processes involved in cellular respiration produce ATP. The oxidized two-carbon molecule, an acetyl group, is attached to Coenzyme A to form acetyl CoA. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Oxygen is the final electron acceptor in this respiratory cascade, and its . Electrons are passed from one member of the transport chain to another in a series of redox reactions. Both oxaloacetate and citric acid will decrease. A. mitochondrial matrix 1/3 Remember that all aqueous solutions contain a small amount of hydronium (HO) and hydroxide (OH) due to autoionization. I mean in glycolysis, one glucose is oxidised into two pyruvic acid and two NADHs. However, in the context of biology, there is a little trick we can often use to figure out where the electrons are going. D. In the absence of NAD+, glycolysis can still function. C. NADH B. have a lot of oxygen atoms. C. citric acid cycle Why would ATP not be able to be produced without this acceptor (oxygen)? C. It is found in prokaryotic cells but not in eukaryotic cells. 1. B. C. The advantage of an electron transport chain is that a small amount of energy is released with the transfer of an electron between each pair of intermediates. What do we mean by that? FADH2 in the matrix deposits electrons at Complex II, turning into FAD and releasing 2 H+. Furthermore, where did the hydrogen to build NADH come from? What does the structure of Co-enzyme A look like? C. oxidative phosphorylation. provide the energy that establishes the proton gradient. C. pyruvate D. Reduction. Energy contained in the bonds of glucose is released in small bursts, and some of it is captured in the form of, As a glucose molecule is gradually broken down, some of the breakdowns steps release energy that is captured directly as ATP. D. are easily reduced. B. glycolysis Most of the electrons removed from glucose by cellular respiration are used for which of the following processes? C. Ionic and covalent. A. Direct link to MomoTane's post NAD+ --> NADH is reductio, Posted 4 years ago. 1. synt. So, where does oxygen fit into this picture? C. yield energy in the form of ATP as it is passed down the respiratory chain D. It allows for an increased rate of glycolysis. (C) reduce carbon atoms to carbon dioxide. Direct link to aida raihan's post i still cant understand t, Posted 7 years ago. In mitochondria, exergonic redox reactions a. are the source of energy driving prokaryotic ATP synthesis. What happ. Fermentation is essentially glycolysis plus an extra step in which pyruvate is reduced to form lactate or alcohol and carbon dioxide. The electron carriers take the electrons to a group of proteins in the inner membrane of the mitochondrion, called the electron transport chain. Substrate-level phosphorylation occurs _____. C. ATP synthase pumps protons by active transport. A. oxidative phosphorylation (chemiosmosis) It is sort of like a pipeline. Cytosol Our body recycles 70% of CO2 by hydrolysis. A. NADH gains electrons in the initial reaction of the electron transport chain. If we consider the two pyruvates that enter from glycolysis (for each glucose molecule), we can summarize pyruvate oxidation as follows: Two molecules of pyruvate are converted into two molecules of acetyl. A. energy released from substrate-level phosphorylation D. The chemiosmotic synthesis of ATP occurs only in eukaryotic cells, because it occurs in mitochondria. When organic fuels like glucose are broken down using an electron transport chain, the breakdown process is known as. The enzyme protein comes next on the chain, followed by a covalently bonded sulphur molecule, which is then lastly attached to the removable functional group, the acetyl group -COCH3, What role does Coenzyme A play in the potential energy of CoA? E. oxygen. Two net ATP are made in glycolysis, and another two ATP (or energetically equivalent GTP) are made in the citric acid cycle. Direct link to Tallyho's post What role does Coenzyme A, Posted 4 years ago. C. It represents the first stage in the chemical oxidation of glucose by a cell. Like the questions above. The bicarbonate buffer system is what creates H ions. A. dehydrogenated Protons flow down their concentration gradient into the matrix through the membrane protein ATP synthase, causing it to spin (like a water wheel) and catalyze conversion of ADP to ATP. B. carbon dioxide A. glucose Or are the Hydrogen ions that just came back through the ATP synthase going to be used for forming H2O?? To illustrate, let's use the example from Sal's video: This reaction does not involve an obvious electron transfer, but it's still an example of a redox reaction. how does the nadh from glycolisys gets into the matrix so its electron could be used? Without enough ATP, cells cant carry out the reactions they need to function, and, after a long enough period of time, may even die. In mitochondria, exergonic redox reactions Direct link to Torzawessling69's post What exactly is NAD+ and , Posted 7 years ago. The reactions that extract energy from molecules like glucose are called, In a cell, this overall reaction is broken down into many smaller steps. Direct link to yejikwon00's post Where did all the hydroge, Posted 5 years ago. As electrons move through the electron transport chain, they go from a higher to a lower energy level and are ultimately passed to oxygen (forming water). These chief functions are reliant on electron transfer reactions and the production of ATP and reactive oxygen species (ROS). A glucose molecule is completely broken down to carbon dioxide and water in glycolysis and the citric acid cycle, but together these two processes yield only a few molecules of ATP. b. NADH is only oxidized by the electron transport chain only in respiration. It increases the surface for substrate-level phosphorylation. E. water. Direct link to Ellie Bartle's post Substrate level is the 'd, Posted 5 years ago. B. oxidized, and energy is released In chemiosmosis, what is the most direct source of energy that is used to convert ADP + i to ATP? B. water Electron Transport Chain and Oxidative Phosphorylation. (b) How does the energy of radar waves compare with that of red light (greater or smaller)? reduce carbon atoms to carbon dioxide. Which molecule is oxidized and what kind of bond is formed? E. Glucose is consumed, and carbon dioxide is produced. B. NAD+ Posted 7 years ago. D. is driven by ATP consumption, The chemiosmotic hypothesis is an important concept in our understanding of cellular metabolism in general because it explains _____. b) Electrons will flow from a more negative electrode to a more positive electrode. The FADH dropps off the H+s at the second protein complex, and since the H+s it brings in only go through 2 proteins, it only makes 2 ATP for every FADH molecule. Provide the energy that establishes the proton gradient Is burning wood an example of an exergonic or endergonic reaction? D. 38 ATP, 6 CO2, 3 NADH, and 12 FADH2, In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. Overall, what does the electron transport chain do for the cell? Glucose is the primary fuel for cellular respiration. Click here for a diagram showing ATP production, http://www.dbriers.com/tutorials/2012/04/the-electron-transport-chain-simplified/. You have a friend who lost 7 kg (about 15 pounds) of fat on a regimen of strict diet and exercise. A. during oxidative phosphorylation Fortunately for us, our cells and those of other living organisms are excellent at harvesting energy from glucose and other organic molecules, such as fats and amino acids. Direct link to Ivana - Science trainee's post Roles of CoA are: C. how ATP is synthesized by a proton motive force B. the oxidation of pyruvate to acetyl CoA Mitochondria are like small factories that generate energy in the form of ATP molecules. What would be the period of a satellite in a low orbit around this large, dense planet? The goal of cellular respiration is to capture this energy in the form of ATP. Which of the following pairs of pathways and their location in the cell is incorrectly matched? The electron flow from reduced substrates through an ETC is like the movement of electrons between the poles of a battery. The process of oxidative phosphorylation is still a bit unclear. D. the electron transport chain A. 2H2 + O2 2H2 O + energy OC. C. O2 is oxidized and H2O is reduced. C. energy released as electrons flow through the electron transport system In mitochondria, exergonic redox reactions (A) are the source of energy driving prokaryotic ATP synthesis. Lactic acid fermentation produces lactate, and alcohol fermentation produces ethanol. C. glycolysis and fermentation This site is correct. well, seems like scientists have recently discovered that the old ATP yield is not quite accurate, and the most recent data shows that it should be around 26-28, I thought it was 38 ATPs from the previous videos. Glycolysis produces 2 ATP and 2 NADH, Krebs Cycle produces 2 ATP, 6 NADH, and 2 FADH2. C. carbon dioxide (CO2) D. redoxed. A. Glycolysis occurs in the mitochondria. E. ATP. Which of the following molecules can also be used by cellular respiration to generate ATP? In which process is glucose oxidized to form two molecules of pyruvate? E. Chemiosmotic ATP synthesis requires oxygen. Inside the matrix of the mitochondrion, substrate-level phosphorylation takes place when a phosphate group from an intermediate of the glucose breakdown reactions is transferred to ADP, forming ATP. When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs? Direct link to Stephanie Trochez's post My textbook states that t, Posted 6 years ago. D. the reduction of oxygen to water in the final steps of oxidative metabolism, During aerobic respiration, electrons travel downhill in which sequence? Question: In mitochondria, exergonic redox reactions are coupled via phosphorylated intermediates to endergonic processes. A. gains electrons and gains potential energy Did you mean the opposite of what you wrote? A. reduction of pyruvate to lactate Direct link to Ivana - Science trainee's post `C6H12O6 + 6O2 6CO2 + 6, Posted 5 years ago. Direct link to Ashley Jane's post Where do the hydrogens go, Posted 5 years ago. During the energy investment phase of glycolysis, __________. D. glycolysis. A. combine with carbon, forming CO2 C6H12O6 + 6 O2 6 CO2 + 6 H2O + Energy Most of the energy from the original glucose molecule at that point in the process, however, is in the form of _____. usually the enzymes and intermediates are most important, and also the by-products released, ie, the NADH, FADH, and GTP. Nicotinamide adenine dinucleotide (NAD+/NADH) - a co-enzyme that carriers both electrons (e-) and protons (H+), two of each. Direct link to Ivana - Science trainee's post Yes, further apart orbita, Posted 7 years ago. So it can be any whole number of ATPs, probably 34, 36, or 38 ATPs in a eukaryotic cell. In mitochondria exergonic redox reactions? What is going on? (D) are coupled via phosphorylated intermediates to endergonic processes. Eventually, the electrons are passed to oxygen, which combines with protons to form water. You, like many other organisms, need oxygen to live. When protons flow back down their concentration gradient (from the intermembrane space to the matrix), their only route is through ATP synthase, an enzyme embedded in the inner mitochondrial membrane. Here, well get a high-level overview of how cells break down fuels. A. Direct link to Amelie Olsen Galvan's post Do all catabolic processe, Posted 4 years ago. C. Plants carry out cellular respiration only in organs such as roots that cannot carry out photosynthesis. This conflicts with what is being presented here. 3. So, even though no electrons were fully gained or lost in the above reaction: For you chemistry buffs out there, this change in electron hogging during the reaction can be more precisely described as a change in oxidation states of the, Oxidation and reduction reactions are fundamentally about the transfer and/or hogging of electrons. In eukaryotes, this step takes place in the matrix, the innermost compartment of mitochondria. A. Direct link to Hello it's me's post Actually, the amount of A, Posted 4 years ago. Oxygen is what allows the chain to continue and keep producing ATP. According to the amont of water molecules generated in chemiosmosis, all the hydrogen from the glucose should be used to form water, so do protons go into the mitochondria or mitochondria has extra protons itself? B. reduce FAD+ to FADH2 C. 2 NADH, 2 pyruvate, and 2 ATP A. D. The electron acceptor is reduced. Krebs Cycle Show full question + 20 A. molecular oxygen (O2) After completion of the citric acid cycle, most of the usable energy from the original glucose molecule is in the form of __________. A. none, because all of the available energy remains in either lactate or ethanol B. C. The oxidation of compounds by the citric acid cycle requires molecular oxygen. d) E0^00 cell is the difference in voltage between the anode and the cathode. Question: In mitochondria, exergonic redox reactions are the sources of energy driving prokaryotic ATP synthesis.
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