Page <> of 6ZOOM +name:3. In the last reaction of the citric acid cycle, malate is dehydrogenated to regenerate theoxaloacetate necessary for the entry of acetyl-CoA into the cycle:L-Malate + NAD+→ oxaloacetate + NADH + H*AG'° = 30.0 kJ/mol(a) Calculate the equilibrium constant for this reaction at 25 °C.(b) Because AG°' assumes a standard pH of 7, the equilibrium constant calculated in (a)corresponds to[oxaloacetate][NADH]Keq[L-malate][NAD*]The measured concentration of L-malate in rat liver mitochondria is about 0.20 mM when[NAD*]/[NADH] is 10. Calculate the concentration of oxaloacetate at pH 7 in thesemitochondria.(c) To appreciate the magnitude of the mitochondrial oxaloacetate concentration, calculate thenumber of oxaloacetate molecules in a single rat liver mitochondrion. Assume the mitochondrionis a sphere of diameter 2.0 microns.

The ultimate reaction of the citric acid cycle marks the regeneration of oxaloacetate by the…

Answered: Page < > of 6 ZOOM + name: 3. In the…

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter20: Electron Transport And Oxidative Phosphorylation

Section: Chapter Questions

Problem 12P

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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?
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Energetics of the Hexokinase Reaction The standard-state free energy change. Gfor the hexokinase reaction, is â€” 1 6.7 kJ/mol. Use the values in Table I to calculate the value of Gfor this reaction in the erythrocyte at 37Â°C.
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.
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In the complete b-oxidation of stearic acid (18:0), a) how many moles of acetyl CoA are produced? b) how many times would the fatty acid pass through the fatty acid spiral for complete oxidation? c) what is the total ATP produced in the citric acid cycle? d) how many moles of NADH are produced? e) how many moles of FADH2 are produced? f) how many moles of ATP are produced after all NADH are reoxidized in the respiratory chain? g) how many moles of ATP are produced after all FADH2 are reoxidized in the respiratory chain? h) how many moles of ATP are produced from the complete oxidation of stearic acid?
Calculate the ΔG for Malate dehydrogenase reaction of CAC if the concentration of oxaloacetate is 1x 10-8 M, malate is 0.2 mM, NAD+ is 10 mM and NADH is 0.1 mM in rat liver mitochondria. ΔGo’ for this reaction is 30 kJ/mole. Please write the units of the final answer and the formula you are using to solve. R = 0.008314kJ/K*mol, T = 298K
In the complete b-oxidation of stearic acid (18:0) What is the total ATP produced in the citric acid cycle? How many moles of NADH are produced?
Consider the complete oxidation of one mole of arachidic acid (20:0). ___________ a. How many rounds of the β-oxidation pathway will be involved? ___________ b. How many acetyl CoA will be produced? ___________ c. How many NADH will be produced from all the rounds of the β-oxidation pathway? ___________ d. How many ATP will eventually be produced from the complete oxidation of one mole of arachidoyl CoA?
Given the following information, calculate the physiological ΔG of the isocitrate dehydrogenase reaction at 25°C and pH 7.0: [NAD+]/[NADH] = 8, [α-ketoglutarate] = 0.1 mM, and [isocitrate] = 0.02 mM. Assume standard conditions for CO2 (ΔG°′ is given in Table). Is this reaction a likely site for metabolic control?
The standard reduction potential for ubiquione (A or coenzyme Q) is .045 V, and the standard reduciton potential (E) for FAD is -0.219 V. Using these values, show that the oxidation for FADH2 by ubiquinone theoretically liberates enough energy to drive the synthesis of ATP. Faraday constant =96.48KJ/Vol delta G' standard for ATP Synthesis is +30.5 KJ/mol R=8.314 J/mol K=1.987 cal/mol K
Does the complete oxidation of tridecanoic acid (C13:0) make more ATP than the complete oxidation of 9-tetradecenoic acid (C14:1, Δ9) inside human body? Show your calculation.

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