Enzyme Classes

Question 1

Hydrolase

Answer 1

Hydrolyzes chemical bonds (includes ATPases, proteases and others)

Question 2

Isomerase

Answer 2

Rearranges bonds within a molecule to form an isomer

Question 3

Ligase

Answer 3

Forms a chemical bond (DNA ligase)

Question 4

Lyase

Answer 4

Breaks chemical bonds by means other than oxidation or hydrolysis
Eg pyruvate decarboxylase

Question 5

Kinase

Answer 5

Transfers a phosphate group to a molecule from a high energy carrier such as ATP
Eg phosphofructokinase PFK

Question 6

Oxidoreductase

Answer 6

Runs redox reactions

Includes oxidase reductases dehydrogenases and others

Question 7

Polymerase

Answer 7

Polymerization

Eg, addition of nucleotides to the leading strand of DNA by DNA polymerase 3

Question 8

Phosphatase

Answer 8

Removes a phosphate group from a molecule

Question 9

Phosphorylase

Answer 9

Transfers a phosphate group to a molecule from inorganic phosphate

Eg. Glycogen phosphorylase

Question 10

Protease

Answer 10

Hydrolyzes peptide bonds

Eg. Trypsin, chymotrypsin, pepsin