Biochemistry: Concepts and Connections (2nd Edition)
Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Chapter 12, Problem 6P

Write balanced chemical equations for each of the following: (a) anaerobic glycolysis of 1 mole of sucrose, cleaved initially by sucrose phosphorylase; (b) aerobic glycolysis of 1 mole of maltose; (c) fermentation of one glucose residue in starch to ethanol, with the initial cleavage involving a-amylase.

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Consider the following interconversion, which occurs in glycolysis :(a) What is ΔG′° for the reaction ( K'eq measured at 25 °C)?(b) If the concentration of fructose 6-phosphate is adjusted to 1.5 M and that of glucose 6-phosphate is adjusted to 0.50 M, what is ΔG?(c) Why are ΔG′° and ΔG different?
The glucose/glucose-6-phosphate substrate cycle involves distinct reactions of glycolysis and gluconeogenesis that interconvert these two metabolites. Assume that under physiological conditions, [ATP] = [ADP]; [P;] = 1 mM. Consider the glycolytic reaction catalyzed by hexokinase: ATP + glucose ADP + glucose-6-phosphate AG = - 16.7 kJ/mol (a) Calculate the equilibrium constant (K) for this reaction at 298°K, and from that, calculate the maximum [glucose-6-phosphate]/ Iglucose] ratio that would exist under conditions where the reaction is still thermodynamically favorable. (b) Reversal of this interconversion in gluconeogenesis is catalyzed by glucose-6-phosphatase: glucose-6-phosphate + H20 = glucose + P AG" = -13.8 kJ/mol
1.(a) ( ) Trace the course of [1,6-(C-14)-2,5-(C-13)]glucose that is first processed through glycolysis and proceeds into the TCA cycle. For the glycolysis part, use the diagram below to decide where glucose atoms end up in pyruvate. You need to illustrate only the structures of D-glucose, labeling the atoms, and of pyruvate, labeling the origin of the atoms in glucose and the distribution of the carbon isotopes in py- ruvate. After one round of the TCA cycle where will the labeled carbons be found? HO HO (b) (* CH₂OH Glucose HO + 2 NAD+ O + 2 NADH + 2 Pi 2 F0 + 2 ATP OH + 2 ADP 3 + 2 H₂O Pyruvate The formation of oxaloacetate in the TCA cycle is unfavorable with a AG'° = +29.7 kJ/mol. Write the reactions using structural formulas for the formation of oxaloacetate and for the subsequent reaction in the TCA cycle. What particular part of the subsequent reaction makes it very favorable and ensures that oxaloacetate is continually removed to make the next TCA intermediate?
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Anaerobic Respiration; Author: Bozeman Science;https://www.youtube.com/watch?v=cDC29iBxb3w;License: Standard YouTube License, CC-BY