1. Amylase: Its function is to catalyze the hydrolysis of starch into maltose. According to its production site, it is divided into salivary amylase, pancreatic amylase, intestinal amylase and plant amylase.

2. Maltase: Its function is to catalyze the hydrolysis of maltose into glucose. It is mainly distributed in germinated barley.

3. Sucrase: Its function is to catalyze the hydrolysis of sucrose into glucose and fructose, which is mainly distributed in sugarcane and other organisms.

4. Lipase: Its function is to catalyze the hydrolysis of fat into fatty acids and glycerol. In animals, it is divided into pancreatic lipase and intestinal lipase. It is distributed in the pancreatic juice, plasma and plant seeds of animals.

5. Protease: Its function is to catalyze the hydrolysis of proteins into short peptides. In animals, it is divided into trypsin and pepsin. It is distributed in animal pancreatic juice, gastric juice, plant tissues and microorganisms.

6. Peptidase: Its function is to break down polypeptides into amino acids, which can only be secreted by the small intestine in the human body.

7. Cellulase: Its function is to catalyze the hydrolysis of cellulose into glucose. Contained in fungi, bacteria and higher plants.

8: Pectinase: decomposes pectin in plant cell wall components

9. Glutamic alanine aminotransferase: GPT for short, its main function is to catalyze the reaction between glutamic acid and endoketonic acid. amino conversion between. It is most active in the liver and is often used as an important indicator for diagnosing diseases such as hepatitis.

10. Deaminase: plays a role in deamination, causing the amino group in the amino acid to fall off to become NH3

11. Catalase: widely found in animal and plant cells and some Among microorganisms, the main function is to decompose hydrogen peroxide and prevent hydrogen peroxide from accumulating and harming cells.

12. Tyrosinase: Found in cells of human skin, fur, etc., it can convert tyrosine into melanin.

13. Glutamic acid dehydrogenase: catalyzes the oxidative dehydrogenation of glutamic acid to generate ketoglutarate. It exists in the mitochondria of most cells and is mainly involved in the deamination and amino conversion of amino acids.

14. Helicase: During DNA replication, the two strands must first be unwound to form a single strand. This process relies on DNA helicase.

15. Restriction endonuclease: A nucleic acid shearing enzyme that can recognize specific base sequences in double-stranded DNA. It often cuts staggeredly on the two strands of DNA to produce sticky ends. It is used in genetic engineering. "Scissors".

16.DNA polymerase: used to connect free deoxyribonucleotides during DNA replication

17: RNA polymerase: used to connect free deoxyribonucleotides during transcription Link free ribonucleotides

18. DNA ligase: It forms a phosphodiester bond between adjacent deoxynucleotides to seal the nick in the DNA molecule. It is a key enzyme in genetic engineering. "sewing".

19. Reverse transcriptase: It can synthesize DNA using RNA as a template and is found in some RNA viruses and cancer cells.

20. Lysozyme: widely found in animals, plants, microorganisms and their secretions, it can dissolve polysaccharides in bacterial cell walls and inactivate bacteria. It can also activate the phagocytic function of white blood cells and enhance the body's resistance.

21. Nitrogenase: It can reduce nitrogen in the atmosphere to ammonia. It is composed of two metal-containing proteins, one is ferritin and the other is molybdenum ferritin. This enzyme is found in rhizobia, cyanobacteria and various nitrogen-fixing bacteria in soil.