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

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.

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

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

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

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

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

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.