ENZYME NOMENCLATURE

What is the main enzyme classification system based on?

• Structural features

• Chemical properties

• Functionality

• Enzyme Commission (EC) number

What does the EC number indicate about an enzyme?

• a. Its substrate

• b. Its cofactor

• c. Its catalytic mechanism

• d. Its catalytic reaction

What is the first part of an enzyme’s name?

• a. Species name

• b. Gene name

• c. EC number

• d. Systematic name

How are enzymes named under the EC number system?

• a. Based on the species in which it was discovered

• b. Based on the substrate it acts on

• c. Based on the reaction it catalyzes

• d. Based on its gene name

What is the format for an EC number?

• a. EC n.n.n.n

• b. EC nn.n

• c. EC nnn

• d. EC nn.nn

What does the first digit of an EC number indicate?

• a. Enzyme class

• b. Enzyme sub-class

• c. Enzyme type

• d. Enzyme category

What does the second digit of an EC number indicate?

• a. Enzyme class

• b. Enzyme sub-class

• c. Enzyme type

• d. Enzyme category

What does the third digit of an EC number indicate?

• a. Enzyme class

• b. Enzyme sub-class

• c. Enzyme type

• d. Enzyme category

What does the fourth digit of an EC number indicate?

• a. Enzyme class

• b. Enzyme sub-class

• c. Enzyme type

• d. Enzyme category

How many enzyme classes are there under the EC number system?

• a. 4

• b. 5

• c. 6

• d. 7