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SGU: Metabolism
Biochem: Bioenergetics of Metabolism
| Question | Answer |
|---|---|
| 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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