1. Enzymes
Biological catalyst – it speeds up reactions without being permanently changed

2. Activation Energy
Substrates have some energy within their chemical bonds
They need extra energy added to cause them to change into products.
This is called activation energy.
Enzymes lower the energy needed for a reaction to occur.
After the reaction, the products have less available energy than was in the original substrate

4. Mode of action active site specific form enzyme-substrate complexes
There are two theories on how they work:

5. Lock and Key Hypothesis

6. Induced Fit Hypothesis

7. Factors affecting the rate of enzyme controlled reactions
Enzyme Concentration
Substrate Concentration
Temperature pH

8. Inhibitors
Two types:
Competitive
Non-competitive