1. Energy
    Flows in one direction
  2.  Potential energy
    stored energy  Car at top of hill
  3.   Kinetic energy
    energy in motion  Car rolling downhill
  4. Laws of thermodynamics
    •  First Law     
    • Total amount of energy in the universe is constant.  Energy can change form and be transferred.      

    • Second Law      
    • Energy changes from a more useful to a less useful form.  It becomes increasingly more random. 
  5. Exergonic Reactions
    A chemical reaction where energy is released as a byproduct of the reaction.

    AB ---------} A + B + energy

    Exergonic reactions release energy!
  6. Endergonic Reactions
    Chemical reactions that require an input of energy to make the reaction go.                                  

    A  +  B + energy -------------} AB     

    Endergonic reactions need energy!
  7. ATP and reactions
    • The energy released from an exergonic reaction is used to run an endergonic reaction.
    • Exergonic reaction     
    • ATP --------} ADP + P + energy

    • Endergonic reaction   
    • ADP + P + energy--------} ATP
  8. Metabolism
    • A series of chemical reactions making up a pathway.
    • The pathway may be linear, cyclic or a combination.
  9.  Metabolic reactions
    • - Most metabolic reactions have a small energy difference-
    • - This means that most are reversible.     
    • - Direction of reaction depends on concentrations of reactants and products.  

    Reactants are located on the flat end of the arrow and products on the pointy end!!
Card Set
Biology Energy notes