Homework Answers
9.a) Under standard state of conditions the reaction is non spontaneous as the value is + 17 kJ. Only a negative delG value indicates spontaneous reaction.
b) Forward reaction is non spontaneous ![[Product] 2.303RT 2.30 3 x 19 8 x998 436 Kaal -1,86 logo [ Substrate] 획기36loq 28 マー1.36 log 0.23 -186 x (-0638) 」20 Reaelon- non-8podaneous m,](http://img.homeworklib.com/questions/162144b0-0558-11ec-981a-13cdc8a7afe5.png?x-oss-process=image/resize,w_560)
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9. One of the important reactions in the biochemical pathway glycolysis is the reaction of glucose-6-phosphate(G6P)...
14. The second step of glycolysis is the following reaction: Glucose-6-phosphate = Fructose-6-phosphate At pH 7...
14. The second step of glycolysis is the following reaction: Glucose-6-phosphate = Fructose-6-phosphate At pH 7 and 25 °C, IM of G6P and F6P will equilibrate to [F6P]/[G6P] = 2.43. R, the molar gas constant, is 8.3145 Jmol'K'. A) What is the standard free energy of this reaction at pH 7 and 25 °C? (2 points) B) In the cell the overall AG is -1400 Jmol"!. Calculate the ratio of products to reactants. (2 points)
The conversion of G6P to fructose-6-phosphate (F6P), catalysed by phosphohexose isomerase (PI), is thermodynamically unfavourable under...
The conversion of G6P to fructose-6-phosphate (F6P), catalysed by phosphohexose isomerase (PI), is thermodynamically unfavourable under standard conditions. AG 1.7 k/mol a) Using the data below calculate the mass action ratio (Q) and the AG at 37°C for each pair of G6P and F6P concentrations. [G6P] (HM) [F6P] (HM) Q AG at 37°O 0.8 3.3 2.1 1.2 2.6 0.1 1.3 2.2 2 marks b) Plot your calculated AG values against the natural log (In) of Q. Remember to clearly label...
The enzyme hexokinase catalyzes the following reaction: Glucose + ATP ↔ Glucose 6-phosphate + ADP For...
The enzyme hexokinase catalyzes the following reaction: Glucose + ATP ↔ Glucose 6-phosphate + ADP For this reaction, ΔG° = +16.7 kJ/mol a. Calculate the equilibrium constant for this reaction at 25 °C. Is this reaction spontaneous under standard conditions at this temperature? Calculate the ΔG if the reaction temperature was 25 °C and the concentrations are: glucose, 55.0 mM,; ATP, 5.00 mM; ADP, 1.00 mM; and glucose 6-Phosphate, 0.100 mM. Would the reaction be spontaneous under the conditions of...
Recall the first three reactions in glycolysis: You’ve already learned that, in addition to proceeding through...
Recall the first three reactions in glycolysis: You’ve already learned that, in addition to proceeding through glycolysis, glucose 6-phosphate (G6P) can be used to synthesize a carbohydrate storage molecule called glycogen. Glucose 6-phosphate is also a precursor for the synthesis of nucleotides that are used to build DNA and RNA. The first step of this pathway is catalyzed by an enzyme called glucose 6-phosphate dehydrogenase. Assume that reactions in this pathway with double arrows are reversible under cellular conditions, while...
A highly regulated reaction in glycolysis involves the addition of a second phosphate to fructose-6-phosphate, which...
A highly regulated reaction in glycolysis involves the addition
of a second phosphate to fructose-6-phosphate, which could be be
written as:
Fructose-6-phostphate + Pi à Fructose-1,6-bisphosphate + H2O
The ∆Go’ for this reaction is +16.8 kJ/mol
In a muscle cell at 37 oC, assume the concentration of
Fructose-6phosphate is 0.014 mM and the concentration of phosphate
is 1 mM.
a. What would be the equilibrium concentration of
fructose-1,6bisphosphate under these conditions?
b. What is Keq for this reaction?
Show...
Hexokinase catalyzes the following reaction in glycolysis: Glucose + ATP ← → glucose-6-phosphate + ADP The...
Hexokinase catalyzes the following reaction in glycolysis: Glucose + ATP ← → glucose-6-phosphate + ADP The standard free-energy change for this reaction in the direction written is -16.7 kJ/mol. The concentrations of the related reaction components in the hepatocyte of a mammalian cell are: Glucose: 6 mM Glucose-6-phosphate: 0.074 mM ATP: 1.00 mM ADP: 0.25 mM What is the actual free-energy change for the reaction at body temperature (37 C)?
Consider the given interconversion, which occurs in glycolysis. fructose 6-phosphate glucose 6-phosphate K1.97 What is AG...
Consider the given interconversion, which occurs in glycolysis. fructose 6-phosphate glucose 6-phosphate K1.97 What is AG for the reaction (K measured at 25 °C)? AG -1680.9 kJ/mol If the concentration of fructose 6-phosphate is adjusted to 1.4 M and that of glucose 6-phosphate is adjusted to 0.75 M, what is AG? AG =-4402.59 kJ/mol Which statements are consistent with the conditions at which AG is measured? The temperature is 273 K. The initial concentrations of reactant and product are 1...
Question 1 - Linked Reactions (10 marks) The reaction catalysed by pyruvate kinase is: Phosphoenolpyruvate+ ADPpyruvateATP Keg 3.63 x 105 a) Calculate the AG" for this reaction. Show your work...
Question 1 - Linked Reactions (10 marks) The reaction catalysed by pyruvate kinase is: Phosphoenolpyruvate+ ADPpyruvateATP Keg 3.63 x 105 a) Calculate the AG" for this reaction. Show your working. 3 marks b) The hydrolysis of ATP has following equation: AG 30.5 kJ/mol Calculate the AG" for the following reaction: Phosphoenolpyruvate pyruvateP Show your working. 2 marks c) At 37 °C, the steady-state concentrations of phosphoenolpyruvate, ATP, and ADP have been measured to be 23 HM, 1.85 mM and 140...
During glycogen degradation glucose-1-phosphate is converted to glucose-6-phosphate and is an example of a coupled reaction....
During glycogen degradation glucose-1-phosphate is converted to glucose-6-phosphate and is an example of a coupled reaction. If the phosphoryl group transfer potential for glucose-1-phosphate is -20.9 kJ/mol and for glucose-6-phosphate is -13.8 kJ/mol, then what is the Keq (K) at 298 K? Is the conversion of glucose-1-phosphate to glucose-6-phosphate favorable or unfavorable under standard conditions? ΔG° = -RT ln K where R = 8.315 x 10-3 kJ/mol*K K = 0.057 and the reaction is unfavorable. K = 17.5 and the...
Steps 6 and 8 of the citric acid cycles are _____ reactions. phosphate-transfer hydrolysis oxidation–reduction carboxylation...
Steps 6 and 8 of the citric acid cycles are _____ reactions. phosphate-transfer hydrolysis oxidation–reduction carboxylation The 4-carbon intermediates of the citric acid cycle can be used for _____. gluconeogenesis fatty acid synthesis nucleotide synthesis glycolysis Additional oxaloacetate for the citric acid cycle can be generated in one step from pyruvate glyoxylate citrate acetyl-CoA ΔG°' for a reaction is 800 J · mol–1. What is ΔG at 37°C when the ratio of product to reactant concentrations is 0.6? 640 J...
14. The second step of glycolysis is the following reaction: Glucose-6-phosphate = Fructose-6-phosphate At pH 7 and 25 °C, IM of G6P and F6P will equilibrate to [F6P]/[G6P] = 2.43. R, the molar gas constant, is 8.3145 Jmol'K'. A) What is the standard free energy of this reaction at pH 7 and 25 °C? (2 points) B) In the cell the overall AG is -1400 Jmol"!. Calculate the ratio of products to reactants. (2 points)
The conversion of G6P to fructose-6-phosphate (F6P), catalysed by phosphohexose isomerase (PI), is thermodynamically unfavourable under standard conditions. AG 1.7 k/mol a) Using the data below calculate the mass action ratio (Q) and the AG at 37°C for each pair of G6P and F6P concentrations. [G6P] (HM) [F6P] (HM) Q AG at 37°O 0.8 3.3 2.1 1.2 2.6 0.1 1.3 2.2 2 marks b) Plot your calculated AG values against the natural log (In) of Q. Remember to clearly label...
A highly regulated reaction in glycolysis involves the addition
of a second phosphate to fructose-6-phosphate, which could be be
written as:
Fructose-6-phostphate + Pi à Fructose-1,6-bisphosphate + H2O
The ∆Go’ for this reaction is +16.8 kJ/mol
In a muscle cell at 37 oC, assume the concentration of
Fructose-6phosphate is 0.014 mM and the concentration of phosphate
is 1 mM.
a. What would be the equilibrium concentration of
fructose-1,6bisphosphate under these conditions?
b. What is Keq for this reaction?
Show...
Consider the given interconversion, which occurs in glycolysis. fructose 6-phosphate glucose 6-phosphate K1.97 What is AG for the reaction (K measured at 25 °C)? AG -1680.9 kJ/mol If the concentration of fructose 6-phosphate is adjusted to 1.4 M and that of glucose 6-phosphate is adjusted to 0.75 M, what is AG? AG =-4402.59 kJ/mol Which statements are consistent with the conditions at which AG is measured? The temperature is 273 K. The initial concentrations of reactant and product are 1...
Question 1 - Linked Reactions (10 marks) The reaction catalysed by pyruvate kinase is: Phosphoenolpyruvate+ ADPpyruvateATP Keg 3.63 x 105 a) Calculate the AG" for this reaction. Show your working. 3 marks b) The hydrolysis of ATP has following equation: AG 30.5 kJ/mol Calculate the AG" for the following reaction: Phosphoenolpyruvate pyruvateP Show your working. 2 marks c) At 37 °C, the steady-state concentrations of phosphoenolpyruvate, ATP, and ADP have been measured to be 23 HM, 1.85 mM and 140...
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