Major Enzymes

Question 1

What is an Oxidoreductase?

Answer 1

catalyzes an oxidation-reduction rxn
b/w two molecules

subclass = Dehydrogenase

Question 2

What is a Dehydrogenase?

Answer 2

catalyzes a redox reaction involving 2 e- & 1 or 2 H+
between 2 molecules, one of which is
NAD(P)H/NAD(P)+ /FADH2/ FMN

Subclass of Oxidoreductase

Question 3

What is a Transferase?

Answer 3

catalyzes the transfer of functional groups between molecules

Subclass = Kinase

Question 4

What is a Kinase?

Answer 4

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

Subclass of Transferase

Question 5

What is Hydrolase?

Answer 5

catalyzes the transfer of a functional group to H2O
(i.e. XY + H2O -> XOH + YH)

Question 6

What are Lyases?

Answer 6

catalyze the splitting of 1 molecule into 2 molecules, with nothing else lost or gained (i.e. not hydrolysis or redox).

Subclass = Synthase

Question 7

What is Synthase?

Answer 7

catalyzes the exact opposite of what a lyase catalyzes.
Synthases catalyze the joining of 2 molecules to make 1 molecule without ATP involvement.

Subclass of Lyase

Question 8

What is Isomerase?

Answer 8

catalyzes an
internal rearrangement/ isomerization

Question 9

What is a Synthetase / Ligase?

Answer 9

catalyzes the joining of 2 molecules in a reaction requiring ATP or GTP

Question 10

What is Decarboxylase?

Answer 10

catalyzes non-oxidative decarboxylation reactions