- Enzymes are protein molecules that function to increase the rates of chemical reactions. On the surface of an enzyme are specific binding sites for substrates, and depending upon the enzyme, other binding
- sites exist for molecules that either decrease or increase enzyme activity. Enzymes do not alter the free energy change of chemical reactions.
The factors that can alter enzyme activity are cofactors, temperature, pH, enzyme concentration, substrate concentration, the type of isozyme, inhibitors, and activators.