Enzyme Classes

Question 1

Hydrolase

Answer 1

General term for enzymes that catalyze a hydrolytic cleavage reaction

Question 2

Nuclease

Answer 2

Breaks down nucleic acids by hydrolyzing bonds between nucleotides

Question 3

Protease

Answer 3

Breaks down proteins by hydrolyzing peptide bonds between amino acids

Question 4

Ligase

Answer 4

Joins two molecules together; DNA ligase joins two DNA strands together end-to-end

Question 5

Isomerase

Answer 5

catalyzes the rearrangement of bonds within a single molecule

Question 6

Polymerase

Answer 6

Catalyzes polymerization reactions such as the synthesis of DNA and RNA

Question 7

Kinase

Answer 7

Catalyzes the addition of phosphate groups to molecules. Protein kinases are important group of kinases that attach phosphate groups to proteins

Question 8

Phosphatase

Answer 8

Catalyzes the hydrolitic removal of a phosphate group form a molecule

Question 9

Oxido-Reductase

Answer 9

general name for enzymes that catalyze reactions in which one molecule is oxidized while the other is reduced. Enzymes of this type are often called oxidases, reductases or dehydrogenases

Question 10

ATPase

Answer 10

Hydrolyzes ATP. Many proteins have an energy-harnessing ATPase activity as part of their function, including motor proteins such as myosin and membrane transport proteins such as the Na+ pump