1. Biology Activator: 12/16/13
Pass in your literature review. If you don’t have it done by the end of the school day you will be serving a homework detention after school with me at 2:30.
Read through each I Can… statement about enzymes. If you feel 100% confident that you can do what the statement says check the first column.

2. Chemistry of Life: section 2-4 Energy and Chemical Reactions
Metabolism – how does it fit in here?
Activation Energy
is the energy needed to start a chemical reaction
Enzymes
Substances that increase the speed of chemical reactions
Most enzymes are proteins
Catalysts - reduce the activation energy of a chemical reactions
Help maintain homeostasis (speed too slow to sustain life)

3. Enzyme example:
Blood carries carbon dioxide, CO2, (waste product made by your cells) to your lungs, to exit your lungs when you breath. In the lungs, carbon dioxide reacts with water, H2O, to form carbonic acid, H2CO3:
CO2 + H2O Carbonic Ahydrase H2CO3
If this enzyme wasn’t present in your body you would never be able to get rid of this waste fast enough in your bady to keep living. It multiplies this by about 10million times faster that it normally would.

4. Starch Amylase Glucose
Enzymes Continued…
Substrate – the substance on which an enzyme acts during a chemical reaction
Enzymes act on only specific substrates
Example: the enzyme amylase assists in the breakdown of starch to glucose in the following reaction
Starch Amylase Glucose
Shape determines its activity
Deep folds on surface, folds form pockets called Active Sites.
An active site is where the substrate fits into the enzyme

9. Step By Step enzyme substrate contact
Contact occurs between the substrate and enzyme, Enzyme shape changes to a tight hold on the Substrate
At active site, interaction occurs, reduction of activation energy, Substrate more likely to react
Reaction finished when products formed, Enzyme can catalyze further reactions

10. Acids/Bases/pH effect on Enzymes
All enzymes work best under a certain specific pH
Other pH’s can cause the enzyme to denature (change shape) and no longer function

11. Temperature effects on Enzymes
All enzymes work best under a certain specific temperature
Other temperatures can cause the enzyme to denature and no longer function