1. Catalase Sources - plant tissues e.g. potato tuber, apple animal tissues e.g. liver, muscle hydrogen peroxide ----------  water + oxygen Speed up the break down of hydrogen peroxide to water and oxgen

2. Importance of catalase Hydrogen peroxide is a toxic metabolic by-product produced in metabolic reactions. It is harmful when accumulated to high concentration. Catalase can speed up the breakdown of hydrogen peroxide to water and oxygen. So it help the removal of toxic hydrogen peroxide.

3. Amylase Source – saliva, germinating seeds / seedlings, yeast culture Starch + water ---------------  maltose Amylase speeds up the hydrolysis / digestion of starch to maltose. Importance – to digest starch to maltose

4. Invertase (sucrase) Source – yeasts, bacteria, intestinal juice Sucrose + water -  fructose + glucose Invertase speeds up the hydrolysis of sucrose to fructose and glucose. Importance – It helps the digestion of sucrose to simple sugar

5. Pepsin Source – gastric juice Protein + water -----  polypeptides Pepsin speeds up the hydrolysis of protein to peptides. Importance – It helps the digestion of protein to polypeptides

6. Trypsin Source – pancreatic juice polypeptide + water --  peptides Trypsin speeds up the hydrolysis of polypeptide to peptides Importance – It helps the digestion of polypeptide to peptides

7. maltase Source – intestinal juice maltose + water  glucose Maltose speeds up the hydrolysis of maltose to glucose Importance – It helps the digestion of maltose to glucose

8. Urease Bacteria, liver ammonia + carbon ---  urea dioxide Urea speeds up the formation of urea from ammonia and carbon dioxide. Urease helps the formation of urea in deamination of excess amino acids.