Enzyme Function and Inhibition Quiz

What is the role of enzymes in biochemical reactions?

• Act as reactants

• Act as catalysts

• Slow down reactions

• Provide energy

Which of the following is an example of a conjugated enzyme?

• Apoenzyme

• Cofactor

• Holoenzyme

• Active site

What type of enzyme catalyzes oxidation-reduction reactions?

• Transferase

• Lyase

• Oxidoreductase

• Ligase

The Michaelis constant (KmK_mKm ) indicates:

• The maximum velocity of a reaction

• The enzyme’s affinity for the substrate

• The pH at which an enzyme works best

• The enzyme concentration

Which of the following is an irreversible enzyme inhibitor?

• Competitive inhibitor

• Noncompetitive inhibitor

• Allosteric inhibitor

• Nerve gas

What is the optimum pH for the enzyme pepsin?

• Neutral pH

• Acidic pH of 2

• Alkaline pH of 8

• pH of 7

Enzymes that catalyze the transfer of a functional group are called:

• Isomerases

• Transferases

• Ligases

• Hydrolases

Which of these enzymes is used as a diagnostic marker for liver disease?

• Lipase

• Amylase

• Alanine aminotransferase (ALT/SGPT)

• Creatine kinase

What is the function of allosteric enzymes?

• Break down substrates

• Regulate enzyme activity through activators or inhibitors

• Bind to competitive inhibitors

• Form irreversible bonds with substrates

A zymogen is:

• An active enzyme

• A protein inhibitor

• An inactive precursor of an enzyme

• An enzyme cofactor