1. Metabolism
Catabolism
Anabolism

2. First Law of Thermodynamics
Eating
Where does the energy come from?
Where does it go?

3. First Law of Thermodynamics
Walking up a hill
Where does the energy come from?
Where does it go?
Sledding down a hill

4. Has energy been created or destroyed?

5. First law of thermodynamics
Energy cannot be created or destroyed

6. Second law of thermodynamics
Energy transfer is not completely efficient, therefore…
Every energy transfer or transformation increases the entropy of the universe
Entropy – Disorder or randomness

7. Second law of thermodynamics
Need energy to decrease entropy
Ex. Cleaning your room
Do not need energy to increase entropy (Spontaneously)
Ex. Your room gets messy without work

8. Energy and reactions Energy – the capacity to do work
Work = force x distance moved

9. Energy and reactions What is the unit on the y axis?
Energy (Gibbs free energy)
Which graph represents more capacity to do work?

10. Energy and Reactions

11. Exergonic and Endergonic reactions

12. This is called energy coupling
Why is this important?
The cells use exergonic processes to drive endergonic processes.
This is called energy coupling

13. Think of a real life example of a primary action that stores potential energy for a secondary action. (ex: pumping water into a holding tank then allowing it to flow through a turbine when electricity is needed)

14. ATP!!!! ATP couples reactions within the cell
What do you think regenerates ATP?
Catabolism!!!! (cellular respiration)