Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 9, Problem 9.4PS
Energetics of Carbohydrate Utilization. The anaerobic fermentation of free glucose has an ATP yield of two ATP molecules per molecule of glucose. For glucose units in a glycogen molecule, the yield is three ATP molecules per molecule of glucose. The corresponding value for the disaccharide sucrose is two ATP molecules per molecule of monosaccharide if the sucrose is eaten by an animal, but two and a half ATP molecules per molecule of monosaccharide if the sucrose is metabolized by a bacterium.
- (a) Explain why the glucose units present in glycogen have a higher ATP yield than free glucose molecules.
- (b) What is the likely mechanism for sucrose breakdown in the gut of an animal to explain the energy yield of two ATP molecules per molecule of monosaccharide?
- (c) Based on what you know about the process of glycogen breakdown, suggest a mechanism for bacterial sucrose
metabolism that is consistent with an energy yield of two and a half ATP molecules per molecule of monosaccharide. - (d) What energy yield (in molecules of ATP per molecule of monosaccharide) would you predict for the bacterial catabolism of raffinose, a trisaccharide?
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Chapter 9 Solutions
Becker's World of the Cell (9th Edition)
Ch. 9 - How are catabolic and anabolic pathways similar?...Ch. 9 - Prob. 9.2CCCh. 9 - Why do oxidation and reduction reactions always...Ch. 9 - How can glucose be oxidized in the absence of...Ch. 9 - In the absence of oxygen, why is it necessary to...Ch. 9 - Prob. 9.6CCCh. 9 - Prob. 1QCh. 9 - Why dont glycolysis (glucose to pyruvate) and...Ch. 9 - Why are the key regulatory enzymes in glycolysis...Ch. 9 - Why do cancer cells carry out high rates of...
Ch. 9 - High-Energy Bonds. When first introduced by Fritz...Ch. 9 - The History of Glycolysis. Following are several...Ch. 9 - Glycolysis in 25 Words or Fewer. Complete each of...Ch. 9 - Energetics of Carbohydrate Utilization. The...Ch. 9 - QUANTITATIVE Glucose Phosphorylation. The direct...Ch. 9 - Ethanol Intoxication and Methanol Toxicity. The...Ch. 9 - Propionate Fermentation. Although lactate and...Ch. 9 - QUANTITATIVE Glycolysis and Gluconeogenesis. As...Ch. 9 - Prob. 9.9PSCh. 9 - Youve Got Some Explaining to Do. Explain each of...Ch. 9 - Arsenate Poisoning. Arsenate (HAsO42) is a potent...Ch. 9 - Life Without Phosphofructokinase. Many bacteria do...Ch. 9 - Prob. 9.13PS
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