Enzyme Classification

Question 1

hydrolase

Answer 1

hydrolyzes chemical bonds
catalyze hydrolytic cleavage
ex: ATPase, protease

Question 2

isomerase

Answer 2

rearranges bonds within a molecule to form an isomer

catalyzes intramolecular rearrangement

Question 3

ligase

Answer 3

forms a chemical bond
catalyze reaction in which two molecules are joined
ex: DNA ligase

Question 4

lyase

Answer 4

breaks chemical bonds by means other than oxidation or hydrolysis
catalyze removal of a group from or the addition of a group to, a double bond or other cleavages involving electron arrangements
ex: pyruvate decarboxylase

Question 5

kinase

Answer 5

transfers a phosphate group to a molecule from a high energy carrier such as ATP
catalyze reactions involving transfer of phosphoric group
ex: phosphofuctokinase

Question 6

oxidoreducatse

Answer 6

runs redox reaction
catalyze oxidation-reduction reactions
ex: oxidases, reductases, dehydrogenases

Question 7

polymerase

Answer 7

polymerization

ex: addition of nucleotide to the leading strand of DNA by DNA polymerase III

Question 8

phophatase

Answer 8

removes a phosphate group from a molecule

Question 9

phosphorylase

Answer 9

transfers a phosphate group to a molecule from inorganic phosphate
ex: glycogen phosphorylase

Question 10

protease

Answer 10

hydrolyzes peptide bond

ex: trypsin, chymotrypsin, pepsin