Classes of Enzymes

Question 1

Hydrolase

Answer 1

catalyzes the cleavage of a molecule by transferring part of it to H2O

Question 2

Oxidoreductase

Answer 2

catalyzes an oxidation-reduction between two molecules

Question 3

Dehydrogenase

Answer 3

catalyzes an O-R reaction involving 2 e- and 1 or 2 H+ between 2 molecules, one of which is NAD(P)H/NAD(P)+

Question 4

Isomerase

Answer 4

catalyzes intramolecular rearrangement

Question 5

Transferase

Answer 5

catalyzes the transfer of chemical groups between molecules

Question 6

Kinase

Answer 6

catalyzes the transfer of a phosphoryl (phosphate) group between two molcules, one of which is ATP

Question 7

Ligase

Answer 7

catalyzes the joining of 2 molecules in a reaction requiring ATP. Usually referred to as a synthetase

Question 8

Synthase

Answer 8

catalyzes the joining of 2 molecules to make 1 molecule without ATP involvement

Question 9

Lyases

Answer 9

catalyze the splitting of 1 molecule into 2 molecules, so opposite of synthases