Question

Write the functions of enzymes. Also, give their classification.

Answer 1

Functions of enzymes:

Where it is made?	Where does it work?	Enzyme	Substrate	Products
Salivary glands	Mouth	Amylase	Starch	Amino acids
Stomach cells	Stomach	Protease	Protein	Amino acids
Liver	Small intestine	Bile salts	Fat	Fat droplets
Pancreas	Small intestine	Amylase, Protease Lipase	Starch Protein Fat	Maltose amino acids glycerol and fatty acids
Small intestine	Small intestine	Maltase Protein	Maltase Protein	Glucose amino acids

 IUB (International Union of Biochemistry) in 1965 classified enzymes into six groups:

Classification of Enzymes:

S.No.	Group of enzyme	Reaction catalysed	Examples
1.	Oxidoreductases	Transfer of hydrogen and oxygen atoms or electrons from one substrate to another.	Dehydrogenases
2.	Transferases	Transfer of a specific group (a phosphate or methyl etc.) from one substrate to another.	Transaminase Kinases
3.	Hydrolases	Hydrolysis of a substrate.	Esterases Digestive enzymes
4.	Isomerases	Change of the molecular form of the substrate.	Phosphohexose isomerase, Fumarase
5.	Lyases	Nonhydrolytic removal of a group or addition of a group to a substrate.	Decarboxylases Aldolases
6.	Ligases(Synthetases)	Joining of two molecules by the formation of new bonds.	Citric acid synthetase