Quiz on Enzymes and Their Functions

What is an enzyme?

• A type of lipid

• A form of nucleic acid

• A compound that acts as a catalyst for biochemical reactions

• A type of carbohydrate

What are the two general structural classes of enzymes?

• Simple and conjugated enzymes

• Simple and complex enzymes

• Protein and non-protein enzymes

• Active and inactive enzymes

What is an apoenzyme?

• The protein part of a conjugated enzyme

• The non-protein part of a conjugated enzyme

• An inactive enzyme

• A type of cofactor

What is a cofactor?

• A type of substrate

• The protein part of an enzyme

• An enzyme inhibitor

• A non-protein part of a conjugated enzyme

What does the term holoenzyme refer to?

• A simple enzyme

• A type of substrate

• A biologically active apoenzyme-cofactor entity

• An inactive enzyme

What is the active site of an enzyme?

• The entire enzyme structure

• The part of the enzyme that is inactive

• The part of the enzyme that binds to the substrate

• The non-protein part of the enzyme

What is enzyme specificity?

• The ability of an enzyme to act on multiple substrates

• The extent to which an enzyme's activity is restricted to a specific substrate

• The temperature at which an enzyme is most active

• The rate at which an enzyme converts substrate to products

Which factor does NOT affect enzyme activity?

• Substrate concentration

• Color of the enzyme

• pH

• Temperature

What is the turnover number of an enzyme?

• The total number of reactions an enzyme can catalyze

• The amount of product formed in a reaction

• The number of substrate molecules transformed per minute by one enzyme molecule

• The number of enzymes in a cell

What is a competitive enzyme inhibitor?

• A molecule that enhances enzyme activity

• A molecule that binds to the active site of an enzyme

• A molecule that binds to a site other than the active site

• A molecule that permanently inactivates an enzyme