Reaction Types

Question 1

Oxidation-reduction

Answer 1

Oxidoreductases
Electron transfer

E.g. Dehydrogenase, reductase

Question 2

Group transfer

Answer 2

Transferases
Transfer of functional groups
E.g. Kinases transfer phosphoryl groups

Question 3

Hydrolytic cleavage

Answer 3

Hydrolases
Cleavage of bond by addition of water = hydrolysis
E.g. Glycosidases, peptidases

Question 4

Non-hydrolytic cleavage

Answer 4

Lyases
Cleavage of bond without water
E.g. F1, 6BP –> DHAP + GAP
Catalyses cleavage of C-C, C-O, C-N

Question 5

Isomerization and rearrangement

Answer 5

Isomerases

• epimerases (UDP-Glc -> UDP-Gal)
• isomerases (Aldo’s -> Ketose)
• mutases (G1P-> G6P)

Question 6

Bond formation using energy

Answer 6

Ligases

• Synthetase (ATP provides energy)
• Synthase (ATP does not directly provide energy