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Life Depends on Energy
What is energy?
1st Law of Thermodynamics
Two types of energy?
2nd Law of Thermodynamics
Metabolism
How can we get energy from foods we eat?Where is the potential energy in foods?How does the potential energy in foods get
converted to kinetic energy useable by cells?
ATP: Adenosine triphosphate
The tail of ATP is vary unstable This means greater potential energy
When a phosphate is transferred to another molecule, energy is released
Energy Coupling
Chemical energy is ‘harvested’ from food molecules Where’s the energy in
food?
This energy is used to recycle ADP to ATP
Enzymes
Your metabolism and ETC are controlled and catalyzed by enzymes
What are enzymes?
How do they work?
Activation Energy
For a reaction to occur, an energy barrier must be surmountedEnzymes make the energy barrier smaller
Induced-Fit Model
Enzymes are substrate specificSubstrates bind to active sitesSubstrates are altered slightly by induced fitInduced fit favors the reaction