BC1B

Question 1

Oxidoreductases

Answer 1

Enzymes catalysing oxidation, reduction or dehydrogenation (e.g. lactate dehydrogenase)

Question 2

Transferases

Answer 2

These catalyse group transfer reactions (e.g.

Kinases )

Question 3

Hydrolases

Answer 3

Catalysing transfer of

groups to H2O (e.g Trypsin)

Question 4

Lyases

Answer 4

Enzyme promoting addition to double bonds or the reverse (e.g Fumarase)

Question 5

Isomerases

Answer 5

Enzymes catalysing rearrangement reactions (e.g. Triose phosphate isomerase)

Question 6

Ligases (synthetases)

Answer 6

Catalyse condensation with simultaneous cleavage of ATP Aminoacyl-tRNA synthetase

Question 7

Allosteric regulation

Answer 7

The regulation of a protein by binding an effector molecule at a site other than the enzyme’s active site. The site to which the effector binds is termed the allosteric site (e.g. ATP, inhibitor of PKF, lowering the affinity of F6P)

Question 8

Retro aldol reaction

Answer 8

Reverse of an aldol reaction, catalyzed by aldolase

Question 9

Chemically-coupled reactions

Answer 9

Sum of the free-energy changes of the individual steps

Question 10

Gluconeogenesis

Answer 10

Glucose synthesis from pyruvate during times of starvation