1. Enzymes in Action Part II
Learning Target:
Enzymes in Action Part II

2. Learning Target #2: Enzymes
I Can… Describe the general role of enzymes in metabolic cell processes.
I Will…
Describe how enzymes work as biological catalysts.
Describe the Lock-and-Key model.
Describe the general characteristics of enzymes including factors that affect how enzymes work.

3. Enzymes – catalyst for living things.
Lowers activation energy
Is NOT a reactant or a product
Is NOT used up or changed in the reaction
Catalyst
Reactants Products
Lowers activation energy needed
Increases Rxn rate

4. Enzymes are specific: Lock-and-Key Model
Substrates/reactants bind to enzyme at active sites (binding sites on enzyme).
Enzyme acts on substrate(s) and weakens bonds (bond energy) Less activation energy needed.
The catalyzed reaction forms a product released from the enzyme.

5. Denaturing Enzymes Almost all enzymes are proteins (polypeptide chain)
Shape / folding is maintained by hydrogen bonds
Temperature and pH greatly affect enzymes
Temperatures just slightly above normal body temp will break the hydrogen bonds

6. Substrate Enzyme Ratio
Not enough enzyme
Optimal
Too much enzyme