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SGU: Metabolism

Biochem: Bioenergetics of Metabolism

QuestionAnswer
What is the Gibb's free energy equation for a reation? DeltaG=deltaH-TdeltaS
What does the Gibb's free energy equation measure? The change in free energy during a chemical reaction.
In what direction does a reaction go if the Delta G is negative? towards products/forward
When Keq is close to 1 in which direction does the reaction go? Reaction is at equilibrium
If the delta G is positive is the reaction spontaneous? No
At what conditions is delta G naut? 1M [] and pH7
If a reaction is endergonic is the delta G positive or negative? positive
What are the high energy compounds? phosphoenolpyruvate, 1,3 bis-P-glycerate, phosphocreatine, pyrophosphate, phosphoarginine, acetylCoA
Why is the free energy of ATP hydrolysis so high? many negative phosphate groups in close proximity, resonance of products, and products increases entropy
explain the equation for Gibb’s free energy The amount of free energy in a system is equal to the change of heat in a reaction at constant temperature and pressure minus the increase in disorder (entropy) times the temperature.
Discuss the role of ATP in energy metabolism ATP donates a phosphate group to a substrate to activate it, a irreversible reaction. ATP is the universal form of energy and contains a high energy phosphoanhydride bond.
Describe the importance of coupling of reactions in metabolism the energy produced by one exergonic reaction is used to drive another endergonic reaction. The overall sum of ∆G must be negative.
Created by: mnoronha
 

 



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