Which of the following statements aboutthe TCA cycle is INCORRECT?O a. The TCA cycle can recover much more energythan homolactic fermentation.b. All reactions of the TCA cycle take place in themitochondria.C.The energy released in the TCA cycle is mainlystored in the reduced electron carriers NADH andFADH₂.O d. Under anaerobic conditions the TCA cycle is usedto oxidize pyruvate.Oe. The TCA cycle is also called the citric acid cycleafter the product of the first reaction catalyzed bypyruvate dehydrogenase.

An inventive set of eight reactions makes up the TCA cycle. It is a crucial route that uses a…

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Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter4: How Cells Obtain Energy

Section: Chapter Questions

Problem 9RQ: What do the electrons added to NAD do? a. They become part of a fermentation pathway. b. They go to...

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What do the electrons added to NAD do? a. They become part of a fermentation pathway. b. They go to another pathway for ATP production. c. They energize the entry of the acetyl group into the citric acid cycle. d. They are converted into NADP.
Which of the following best defines fermentation? A) The reduction of metabolic intermediates to regenerate NAD from NADH B) The production of CO2 by the enzymes of the TCA cycle C) The dumping of electrons onto acceptors such as NO3 by the electron transport chain D) The oxidation of metabolic intermediates to regenerate NAD from NADH E) The production of ATP by glycolytic enzymes
Which of the following statements about the TCA cycle is INCORRECT? a. All reactions of the TCA cycle take place in the cytosol. b. The energy released in the TCA cycle is mainly stored in the reduced electron carriers NADH and FADH2. c. The TCA cycle can recover much more energy than homolactic fermentation. d. Under aerobic conditions the TCA cycle is used to oxidize pyruvate. e. The TCA cycle is also called the citric acid cycle after the product of the first reaction catalyzed by pyruvate dehydrogenase.
Fermentation can most accurately be described by which of these? a) The reoxidation of NADH by an electron transport chain. b) A process that occurs in the absence of oxygen. c) An energy producing process found in all anaerobes. d) The direct reoxidation of NADH by an internal organic molecule. e) The use of a terminal electron acceptor other than oxygen.
Which of the following do cellular respiration and fermentation have in common? There might be more than one answer. A) Both of these pathways provide a mechanism for oxidation of glucose B) The citric acid cycle is involved in both of these pathways C) Enzymes are involved in both of these pathways D)ATP synthase is required to complete both of these pathways E)Both of these pathways occur within mitochondria F) ATP is generated in both of these pathways .
Which of these is incorrect regarding fermentation?a. There is a net gain of only two ATP per glucose.b. It occurs in the cytoplasm.c. The process starts with glucose entering glycolysis.d. NADH donates electrons to the electron transport chain.e. It is anaerobic.
Which of the following statements concerning the location of the metabolic pathways is correct? a. All reactions of the glycolysis take place in the mitochondria. b. All reactions of the TCA cycle take place in the mitochondria. c. Some reactions of the TCA cycle take place in the cytosol, and some in mitochondria. d. Some reactions of the glycolysis take place in the cytosol, and some in mitochondria.
Fermentations yield only a fraction of the energy available from the complete combustion of glucose. Why is a relatively inefficient metabolic pathway so extensively used?
Which of the following statements concerning alcoholic fermentation is NOT true? a. It occurs under aerobic conditions in yeast. b. It converts pyruvate into ethanol and CO2. c. One molecule of NADH is consumed. d. It generates NAD+ for reuse by glycolysis.
When oxygen is unavailable, some cells use anaerobic (fermentation) pathways to make ATP. Another textbook says regarding fermentation: "The final steps serve only to regenerate NAD+." What does this statement mean? Explain using examples of specific fermentation pathways.
Why is it important to regenerate NAD+ during fermentation?a. It helps maintain the reactions of glycolysis.b. So that it can transfer an electron to the electron transport chainc. To maintain the concentration of pyruvate in a celld. To produce alcohol or lactic acid for the cell
Cytochrome oxidase and succinate-CoQ oxidoreductase are isolated from mitochondria and are incubated inthe presence of oxygen, along with cytochrome c, coenzyme Q,and succinate. What is the overall oxidation–reduction reactionthat can be expected to take place?

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