Energy Conversion Problem 1. a) Influence of concentration on the free energy change. In frog muscle, the concentrations of ATP, ADP, and phosphate are 1.25x10-³ M, 0.50x10-³ M, and 2.50 x10-³ M respectively. Write the reaction and the reaction quotient, Q, for the reaction ATP ADP + P₁. Calculate the free energy change, AG', for the hydrolysis of ATP in muscle cells given the concentrations given above. Assume that AG"=-31.0 kJ mol-¹ for the hydrolysis of ATP, the temperature is 25°C, and the pH=7. b) For this system, what is the maximum amount of work that can be done per mole ATP hydrolyzed? c) In muscle, phosphocreatine serves as a carrier of chemical energy. It can transfer its phosphate group to ADP to replenish the ATP used in muscle contraction. This is an example of energy coupling- using the energy of a very favorable reaction to drive an unfavorable reaction. The enzyme creatine phosphokinase catalyzes the reaction: Net rxn creatine phosphokinase → creatine + ATP AG%= ???? kJ mol-¹ phosphocreatine + ADP d) Show above how you calculate AG°' for the net reaction given that the hydrolysis for phosphocreatine (Phosphocreatine creatine + Pi) is AG"=-43.1 kJ mol-¹. e) Write the equilibrium constant expression and calculate the equilibrium constant of this reaction using AG". f) As ATP is used, the phosphocreatine stores are depleted. Using the ATP and ADP concentrations given above in part a, at what ratio of [creatine]/[phosphocreatine] would you expect the reaction to stop (or reach equilibrium)? Use K from e) and the equilibrium constant expression to solve this problem.
Energy Conversion Problem 1. a) Influence of concentration on the free energy change. In frog muscle, the concentrations of ATP, ADP, and phosphate are 1.25x10-³ M, 0.50x10-³ M, and 2.50 x10-³ M respectively. Write the reaction and the reaction quotient, Q, for the reaction ATP ADP + P₁. Calculate the free energy change, AG', for the hydrolysis of ATP in muscle cells given the concentrations given above. Assume that AG"=-31.0 kJ mol-¹ for the hydrolysis of ATP, the temperature is 25°C, and the pH=7. b) For this system, what is the maximum amount of work that can be done per mole ATP hydrolyzed? c) In muscle, phosphocreatine serves as a carrier of chemical energy. It can transfer its phosphate group to ADP to replenish the ATP used in muscle contraction. This is an example of energy coupling- using the energy of a very favorable reaction to drive an unfavorable reaction. The enzyme creatine phosphokinase catalyzes the reaction: Net rxn creatine phosphokinase → creatine + ATP AG%= ???? kJ mol-¹ phosphocreatine + ADP d) Show above how you calculate AG°' for the net reaction given that the hydrolysis for phosphocreatine (Phosphocreatine creatine + Pi) is AG"=-43.1 kJ mol-¹. e) Write the equilibrium constant expression and calculate the equilibrium constant of this reaction using AG". f) As ATP is used, the phosphocreatine stores are depleted. Using the ATP and ADP concentrations given above in part a, at what ratio of [creatine]/[phosphocreatine] would you expect the reaction to stop (or reach equilibrium)? Use K from e) and the equilibrium constant expression to solve this problem.
Biochemistry
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ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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![Energy Conversion Problem
1. a) Influence of concentration on the free energy change. In frog muscle, the concentrations of ATP, ADP,
and phosphate are 1.25x10-³ M, 0.50x10-³ M, and 2.50 x10³ M respectively. Write the reaction and the
reaction quotient, Q, for the reaction ATP → ADP + P₁. Calculate the free energy change, AG', for the hydrolysis
of ATP in muscle cells given the concentrations given above. Assume that AGº'=-31.0 kJ mol-¹ for the hydrolysis
of ATP, the temperature is 25°C, and the pH=7.
b) For this system, what is the maximum amount of work that can be done per mole of ATP hydrolyzed?
c) In muscle, phosphocreatine serves as a carrier of chemical energy. It can transfer its phosphate group to
ADP to replenish the ATP used in muscle contraction. This is an example of energy coupling - using the
energy of a very favorable reaction to drive an unfavorable reaction. The enzyme creatine phosphokinase
catalyzes the reaction:
Net rxn
phosphocreatine + ADP
creatine phosphokinase
→
creatine + ATP
AG°= ???? kJ mol-¹
d) Show above how you calculate AG" for the net reaction given that the hydrolysis for phosphocreatine
(Phosphocreatine → creatine + Pi) is AGº'=-43.1 kJ mol-¹.
e) Write the equilibrium constant expression and calculate the equilibrium constant of this reaction using
AG⁹¹.
f) As ATP is used, the phosphocreatine stores are depleted. Using the ATP and ADP concentrations given above
in part a, at what ratio of [creatine]/[phosphocreatine] would you expect the reaction to stop (or reach
equilibrium)? Use K from e) and the equilibrium constant expression to solve this problem.
g) Do some research. How does the level of phosphocreatine remain high in muscle cells. Where/how is it
remade from creatine? Look at the enzyme that carries out this reaction. What does it require? How does it
facilitate the coupled reaction? (one paragraph)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc687de40-2a04-4618-94c5-bffabbb64b83%2Fb2c9c87f-dde9-4b13-bf8a-dd7098c0612f%2Fmtkcke8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Energy Conversion Problem
1. a) Influence of concentration on the free energy change. In frog muscle, the concentrations of ATP, ADP,
and phosphate are 1.25x10-³ M, 0.50x10-³ M, and 2.50 x10³ M respectively. Write the reaction and the
reaction quotient, Q, for the reaction ATP → ADP + P₁. Calculate the free energy change, AG', for the hydrolysis
of ATP in muscle cells given the concentrations given above. Assume that AGº'=-31.0 kJ mol-¹ for the hydrolysis
of ATP, the temperature is 25°C, and the pH=7.
b) For this system, what is the maximum amount of work that can be done per mole of ATP hydrolyzed?
c) In muscle, phosphocreatine serves as a carrier of chemical energy. It can transfer its phosphate group to
ADP to replenish the ATP used in muscle contraction. This is an example of energy coupling - using the
energy of a very favorable reaction to drive an unfavorable reaction. The enzyme creatine phosphokinase
catalyzes the reaction:
Net rxn
phosphocreatine + ADP
creatine phosphokinase
→
creatine + ATP
AG°= ???? kJ mol-¹
d) Show above how you calculate AG" for the net reaction given that the hydrolysis for phosphocreatine
(Phosphocreatine → creatine + Pi) is AGº'=-43.1 kJ mol-¹.
e) Write the equilibrium constant expression and calculate the equilibrium constant of this reaction using
AG⁹¹.
f) As ATP is used, the phosphocreatine stores are depleted. Using the ATP and ADP concentrations given above
in part a, at what ratio of [creatine]/[phosphocreatine] would you expect the reaction to stop (or reach
equilibrium)? Use K from e) and the equilibrium constant expression to solve this problem.
g) Do some research. How does the level of phosphocreatine remain high in muscle cells. Where/how is it
remade from creatine? Look at the enzyme that carries out this reaction. What does it require? How does it
facilitate the coupled reaction? (one paragraph)
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