1. Enzymes
Biological Catalysts

2. Enzymes
Enzymes are catalysts that speed up the rate of a chemical reaction.
Some enzymes aid in hydrolysis by breaking large molecules apart
Some enzymes aid in dehydration synthesis by building large molecules from smaller ones
There are many different enzymes, each is specific to its reaction
All enzymes end in -ase

3. Energy of Activation
Enzymes lower the activation energy needed for chemical reactions to occur.

4. How enzymes work Lock-and-Key Model
Enzyme releases two products of the hydrolysis reaction it facilitated
Substrate shape and enzyme shape are specific at active site like a lock and key
Substrate binds to active site. Enzyme facilitates the hydrolysis of the substrate

5. How enzymes work Induced-Fit Model
Enzyme returns to its original shape after the products of hydrolysis are released
After substrate binds at active site the enzyme changes shape slightly