Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 19, Problem 17P
Understanding the Oxidation of Glucose and Its Products in the TCA Cycle Glycolysis, the pyruvate dehydrogenase reaction, and the TCA cycle result in complete oxidation of a molecule of glucose to CO2. Review the calculation of oxidation numbers for individual atoms in any molecule, and then calculate the oxidation numbers of the carbons of glucose, pyruvate, the acetyl carbons of acetyl-CoA. and the metabolites of the TCA cycle to convince yourself that complete
oxidation of glucose involves removal of 24 electrons and that each acetyl-CoA through the TCA cycle gives up 8 electrons.
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generation of one less FADH2 molecule.
Part C
B-oxidation dealls with only saturated fatty acids, but many fatty acids in natural lipids are unsaturated, meaning they contain one or more double bonds. Considering the fatty acid below, calculate the energy yield of its complete oxidation.
OH
Express your answer using three significant figures.
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of pyruvate to acetyl-CoA and of a-ketoglutarate to succinyl-CoA, although catalyzed by different enzymes, are very similar.
Complete the statements to describe how the first stage of fatty acid ẞ oxidation follows a reaction sequence closely resembling
a sequence in the citric acid cycle.
The fatty acyl-CoA dehydrogenase reaction is analogous to the
The enoyl-CoA hydratase reaction is analogous to the
The B-hydroxyacyl-CoA dehydrogenase reaction is analogous to the
reaction.
reaction.
reaction.
aconitase
isocitrate dehydrogenase
citrate synthase
fumarase
a-ketoglutarate dehydrogenase
succinate dehydrogenase
succinyl-CoA synthetase
malate dehydrogenase
Number of electrons generated for complex Il in oxidation of 2 acetyl CoA via the TCA Cycle.
Chapter 19 Solutions
Biochemistry
Ch. 19 - Radiolabeling with 14C-Glutamate Describe the...Ch. 19 - Prob. 2PCh. 19 - Assessing the Effect of Active-Site...Ch. 19 - Understanding the Mechanism of the -Ketoglutarate...Ch. 19 - Understanding the Action of Fluoroacetate on the...Ch. 19 - Prob. 6PCh. 19 - Prob. 7PCh. 19 - Prob. 8PCh. 19 - Prob. 9PCh. 19 - Prob. 10P
Ch. 19 - Prob. 11PCh. 19 - Prob. 12PCh. 19 - Prob. 13PCh. 19 - Prob. 14PCh. 19 - Prob. 15PCh. 19 - Prob. 16PCh. 19 - Understanding the Oxidation of Glucose and Its...Ch. 19 - Prob. 18PCh. 19 - Prob. 19PCh. 19 - Prob. 20PCh. 19 - Complete oxidation of a 16-carbon fatty acid can...Ch. 19 - Study Figure 19.18 and decide which of the...Ch. 19 - Prob. 23P
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- Ethanol as a Source of Metabolic Energy (Integrates with Chapters 19 and 20.) Acetate produced in ethanol metabolism can be transformed into acetyl-COA by the acetyl thiokinase reaction: Acetate+ATP+CoASHacetyleCoA+AMP+PPiAcetyle-CoA then can enter the citric acid cycle and undergo oxidation to 2 CO2by this route, assuming oxidative phosphorylation is part of the process? (Assume all reactions prior to acetyl-CoA entering the citric acid cycle occur outside the mitochondrion). Per carbon atom, which is a better metabolic fuel, ethanol or glucose? That is, how many ATP equivalents per carbon atom are generated by combustion of glucose versus ethanol to CO2?arrow_forwardComplete oxidation of a 16-carbon fatty acid can yield 129 molecules of ATP Study Figure 19.2 and determine how many ATP molecules would be generated if a 16-carbon fatly acid were metabolized solely by the TCA cycle, in the form of S acetyl-CoA molecules.arrow_forwardEffects of Changing Metabolite Concentrations on Glycolysis In an erythrocyte undergoing glycolysis what would be the effect of a sudden increase in the concentration of a. AΤP? b. AMP? c. fructose-1.6-bisphosphate? d. fructose-2, 6-bisphosphate? e. citrate? f. glucose-6-phospthate?arrow_forward
- The Effect of lodoacetic Acid on the Glyceraldehyde-3-P Dehydrogenase Reaction (Integrates with Chapters 4 and 14.) How might iodoacetic acid affect the glyceraldehydes-3-phosphate dehydrogenase reaction in glycolysis? Justify your answer.arrow_forwardUnderstanding Enzyme Mechanisms Related to Pyruvate Carboxylase Based on the mechanism for pyruvate carboxylase (Figure 22.3), write reasonable mechanisms for the reactions that follow:arrow_forward. Pyruvate can be processed under anaerobic conditions to ethanol (in yeast) or to lactate (in mammals), as shown. Explain the primary purpose of these reactions. Describe the major biochemical features of each reactionarrow_forward
- Long explanations are NOT NEEDED. Answer only d and e. ATP accounting. Consider 1 molecule of the sucrose (monomeric units: glucose and fructose) that will undergo complete oxidation. -Number of pyruvate molecules after glycolysis is 4.-Net ATP produced in glycolysis only (via substrate-level phosphorylation) is 2.-Number of NADH produced using the pyruvate dehydrogenase complex reaction is 1. Now find:d. Number of NADH and FADH2 produced from Krebs cycle.e. Net ATP produced (complete oxidation via Malate aspartate shuttle).arrow_forwardPage > of 6 ZOOM + TCA cycle, oxidative phosphorylation, metabolic regulation TCA cycle (Ch. 16) 1. The citric acid cycle has eight enzymes: citrate synthase, aconitase, isocitrate dehydrogenase, a-ketoglutarate dehydrogenase, succinyl-CoA synthetase, succinate dehydrogenase, fumarase, and malate dehydrogenase. (a) Write a balanced equation for the reaction catalyzed by each enzyme. (b) Name the cofactor(s) required by each enzyme reaction. (c) For each enzyme determine which of the following describes the type of reaction(s) catalyzed: condensation (carbon–carbon bond formation); dehydration (loss of water); hydration (addition of water); decarboxylation (loss of CO2); oxidation-reduction; substrate-level phosphorylation; isomerization. (d) Write a balanced net equation for the catabolism of acetyl-CoA to CO2.arrow_forwardThe Payoff Phase of Glycolysis in Skeletal Muscle In the skeletal muscle, in anaerobic conditions, glyceraldehyde 3- phosphate is converted into pyruvate during the payoff phase of glycolysis; and this pyruvate is reduced into lactate during lactic fermentation. 1-Write the 11 balanced biochemical equations corresponding to all| the reaction steps leading to the conversion of glyceraldehyde-3- phosphate into lactate through glycolysis followed by lactic fermentation. 2-Write the net equation of the whole transformation process (i.e. with glyceraldehyde-3-phosphate as the starting substrate; and lactate as the end product).arrow_forward
- Fatty acid degradation stimulates the citric acid cyclethrough the activation of pyruvate carboxylase by acetylCoA. Why would the activation of pyruvate carboxylaseincrease energy generation from fatty acids?arrow_forwardGlycolysis After digestion of carbohydrates, glucose enters the cell membrane and into the cytoplasm, glycolysis takes place where glucose-6-phosphate (a 6C-molecule) is split into two 3C molecules of gly-3-P, producing 2 pyruvates. The two pyruvates are then converted to two acetyl-CoA and enter the mitochondria where the citric acid occurs. 1. What reactions are involved in the so called, energy-investing reactions? What chemical compound is needed to initiate the reaction? 2. Cite the steps in the glycolysis pathway where these energy-investing reactions occur. 3. The conversion from glu-6-P to fru-6-P involves isomerization, why? 4. What stages in the glycolysis pathway are considered energy harvesting reactions? What are the products of these reactions that will prove its energy yield? 5. The conversion from gly3-P to 1,3-diP uses NAD+ and a dehydrogenase enzyme. What is the role of NAD+? What reactions therefore are involved in these conversions? 6. The conversion…arrow_forwardURGENTarrow_forward
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