What type of reaction is the thermodynamic driver for the formation of 1,3- bisphosphoglycerate from glyceraldehyde-3-phosphate and inorganic phosphate in step 6 of glycolysis? Tautomerization O Oxidation Decarboxylation O Hydrolysis of ATP O Hydrolysis of a CoA thioester
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- 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.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?Comparing Glycolysis Entry Points for Sucrose Sucrose can enter glycolysis by either of two routes: Sucrose phosphorylase: Sucrose + Pi fructose + glucose-1-phosphate Invertase: Sucrose + H20 fructose + glucose Would either of these reactions offer Jin advantage over the other In the preparation of hexoses fur entry into glycolysis?
- Which one of the following regarding the chemistry of glycolysis & gluconeogenesis is FALSE? Reaction 6 of glycolysis catalyzed by glyceraldehyde-3-phosphate dehydrogenase involves oxidation & addition of a P; group. Reaction 3 of gluconeogenesis catalyzed by enolase involves hydration, the addition of water to a carbon-carbon double bond (C=C) to form an alcohol. Reaction 1 of gluconeogenesis catalyzed by pyruvate carboxylase involves decarboxylation. Reaction 9 of gluconeogenesis catalyzed by fructose-1,6-bisphosphatase involves dephosphorylation (phosphoester hydrolysis). Reaction 1 of glycolysis catalyzed by hexokinase involves phosphorylation (using ATP). O 0000Fatty acids are activated for breakdown through the action of acyl-CoA synthestase. Which of the following statements regarding acyl-CoA synthetase is not true? ● It catalyzes the addition of CoA to the fatty acid One of the products of the reaction is ADP. O The free energy change for the reaction catalyzed by this reaction is close to 0 kJ/mol, but the subsequent hydrolysis of pyrophosphate drives the reaction forward. O The reaction results in the formation of a thioester bond.What reaction(s) of the citric acid cycle involve the addition of H20 as OH to the substrate? (Choose all that apply) O conversion of succinyl-CoA to succinate O conversion of succinate to fumarate O conversion of isocitrate to alpha-ketoglutarate O synthesis of citrate from oxaloacetate and acetyl CoA O conversion of alpha-ketoglutarate to succinyl-CoA O conversion of citrate to isocitrate O conversion of malate to oxaloacetate
- The oxidation of Gly-3-P to 1,3-bisphosphoglycerate proceeds with an unfavorable AG which equals 6.3 KJ/mol, yet the flow through this point in the glycolytic pathway proceeds smoothly. Why???What is the function of glyceraldehyde 3-phosphate dehydrogenase? catalyzes the transfer of a phosphoryl group from ATP to an acceptor oxidation of the alcohol to an aldehyde dehydration and dephosphorylation of GAP hydrolysis of GAP oxidation by NAD+ and formation of acyl-phosphateIf a liver extract capable of carrying out normal metabolic reactions (including gluconeogenesis) is incubated with labeled pyruvate labeled with carbon-13 at the carbonyl carbon atom (shown in red below), where would the label be found in glucose? Explain, including schemes of the reactions to support your answer. 13 H3C coo®
- Thioester play an important role in glycolysis and the TCA cycle. Which reactions in glycolysis and tca cycle involve thioesters.Acetyi CoA Oxaloncetate CoA NADH Citrate NAD Isocitrate Malate Funiarate NAD co NADH FADH, FAD a- Ketoghutarate Succinate co, NAD+ ATP Succinyl CuA NADH ADP - P For each molecule of glucose (C6H12O6) oxidized by cellular respiration, how many moles of CO2 are released in the citric acid cycle? (see the figure above) а. 2 b. 4 с. 6 d. 0 е. 3What if the phosphate group for the glycolysis reaction with enzyme glyceraldehyde 3-phosphate dehydrogenase was from ATP instead of Pi? What would the complete, balanced, net rxn of glycoslysisequation be and how does this impact the overall glycolysis rxn?