Which of the following statements about the use the NADPH generated from the pentose phosphate pathway is not true? NADPH generated from the pentose phosphate pathway is used for the synthesis of fatty acids. b. NADPH generated from the pentose phosphate pathway and cytoplasmic NADH is metabolically interchangeable. O c. NADPH generated from the pentose phosphate pathway is used for the regeneration of glutathione to its reduced state. O d. NADPH generated from the pentose phosphate pathway is used for lipid synthesis. Clear my choice

Which of the following statements about the use the NADPH generated from the pentose phosphate pathway is not true? NADPH generated from the pentose phosphate pathway is used for the synthesis of fatty acids. b. NADPH generated from the pentose phosphate pathway and cytoplasmic NADH is metabolically interchangeable. O c. NADPH generated from the pentose phosphate pathway is used for the regeneration of glutathione to its reduced state. O d. NADPH generated from the pentose phosphate pathway is used for lipid synthesis. Clear my choice

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 statements is CORRECT regarding the pentose phosphate pathway? a. It has two reactions that produce NADPH in its oxidative phase. b. The pentose phosphate pathway is also called hexose diphosphate shunt. c. The pathway generates FADH2. d. NAPH is produced in the non-oxidative phase of the pathway.
Rapidly dividing cells such as bone marrow, skin, intestinal mucosa, and cancer cells need DNA synthesis. In these cells, the following is observed: a. a decreased NADPH / NADP+ ratio b. increased flux through the oxidative reactions c. Flux through the oxidative reactions is low and the nonoxidative reactions are reversed to make ribose 5-phosphate. d. Ribose 5-phosphate is recycled through the oxidative steps via the nonoxidative reactions and gluconeogenesis. e. Ribose 5-phosphate is shunted into glycolysis by the nonoxidative reactions.
What is the energy yield in ATP molecules associated with each of the following : a. Glucose > 2 pyruvate (aerobic / anaerobic conditions) b. NADH → NAD+ с. 2 рyruvate 2 аcetyl-CoA + 2 СО, d. acetyl-CoA > 2CO, + 3NADH+ FADH2 (CAC ) e. FADH, → FAD f. Glucose + 6 0,> 6 СО, + 6 H,о g. САС, сombined with the ETC (аcetyl-CoA 2CО)
ATP levels are high in the liver, NADPH levels are low, but fat biosynthesis needs to happen. What is the function of the pentose phosphate pathway? a. Mode 1 - NADPH and ribose 5-phosphate are being generated b. Mode 2 - ribose 5-phosphate is needed, so only the non-oxidative portion is being used for carbon skeleton rearrangments c. Mode 3 - NADPH is needed, so oxidative portion is operating to make NADPH and non-oxidative portion is operating to regenerate glucose 6-phosphate d. Mode 4 - NADPH and ATP are needed, so oxidative portion makes NADPH, non-oxidative portion does carbon skeleton rearrangements to fuel glycolysis and make ATP
Pyruvate dehydrogenase complex is the key enzyme that regulates the TCA cycle. De-phosphorylation of this enzyme by phospho-protein phosphatase makes it active. Which of the following compounds is expected to activate phospho-protein phosphatase? Acetyl COA a. O b. NADH Ca²+ O C. O d. ATP
Since in this patient pyruvate kinase is abnormal not only is less pyruvate made but intermediates above pyruvate in the glycolytic pathway build up slowing the pathway. which of the following would be expected? A.ADP to ATP ratios would be elevated above normal. B.NADP+ would increase relative to NADPH. C.Ribulose 5-phosphate levels would decrease. D.NADH to NAD+ ratios would decrease. E.Methemoglobin levels would increase. Explanation for answer in no. 6:
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.
Which of the following statements about the TCA cycle is INCORRECT? O a. The TCA cycle can recover much more energy than homolactic fermentation. b. All reactions of the TCA cycle take place in the mitochondria. C. The energy released in the TCA cycle is mainly stored in the reduced electron carriers NADH and FADH₂. O d. Under anaerobic conditions the TCA cycle is used to oxidize pyruvate. Oe. The TCA cycle is also called the citric acid cycle after the product of the first reaction catalyzed by pyruvate dehydrogenase.
In the first stage of glycolysis, the hydroxyl group on C6 of glucose is phosphorylated to form glucose-6-phosphate (G6P). In this reaction, which of the following statements is true? a. O b. d. e. Glucose kinase is used to catalyze the reaction. Hexokinase is used to catalyze the reaction. A molecule of NADH is synthesized. One ATP is synthesized. Fructose kinase is used to catalyze the reaction.
Cyanide toxicity results from its ability to inhibit cytochrome oxidase c, part of the ETC of cell respiration. What effect(s) might you expect from cyanide poisoning? U a. Intracellular accumulation of NADH. Ob. Rapid depletion of oxygen. Increased amounts of oxidative phosphorylation. Od. Inhibition of PFK would occur. U e. Decreased production of ATP
A. What is substrate level phosphorylation. B. Although oxygen does not participate directly in the citric acid cycle , the cycle only operates when oxygen is present. Why is this so so ? C.describe how hibernating animals and new born babies are able to keep warm without shivering. D. What is the metabolic purpose of hexose monophospate shunt pathway E.hg does G6PD deficient individuals have increase in resistance to malaria?