1. Chemical reactions and enzymes

2. Chemical reactions Occur when 1 set of molecules change into another
1 CH4 + 2 O2  1CO2 + 2 H2O
Reactants
Products
Molecules that enter reaction
Molecules that are produced

3. Energy in reactions

4. Enzymes
Catalysts
Substance that speeds up a reaction but is not used up or changed by the reaction
Heat does not work – not specific and would damage cells

5. Enzymes Catalysts Proteins
Lower activation energy  speeds up reaction
Very specific  due to tertiary folding (definite shape)

6. Enzymes Work? Substrates (reactants) bind to enzyme at active site
Enzyme positions reactants allowing for reaction to take place
Release products

7. Enzymes Factors affecting enzyme function Temperature
Cold slows down reactions
Body temperature  ideal
Slightly above body temperature  slightly faster
Higher temperature  denatures (changes shape) enzymes, no longer works
pH  denatures enzyme