Biochemistry Enzymes Quiz

What are enzymes?

• Lipids

• Nucleic acids

• Carbohydrates

• Protein catalysts

What is the shape of enzymes?

• Globular

• Linear

• Spherical

• Fibrous

Which class of enzymes involves the transfer of C, N, or P?

• Hydrolases

• Isomerases

• Oxidoreductases

• Transferases

What is the turnover number of an enzyme?

• Number of catalytic cycles per unit time

• Number of substrates per enzyme molecule

• Number of products per enzyme molecule

• Number of enzyme molecules per substrate

What is the purpose of enzymes in a metabolic organism?

• To alter standard free energy changes

• To change equilibrium constants

• To speed up reactions

• To slow down reactions

Which model describes enzyme-substrate interactions as a lock and key?

• Lock and Key Model

• Non-competitive Model

• Induced Fit Model

• Competitive Model

What is the effect of increasing temperature on enzyme activity?

• Stabilizes the enzyme

• Increases velocity until denaturation

• Has no effect

• Decreases velocity

Which type of inhibition involves a molecule that mimics the substrate and competes for the active site?

• Competitive Inhibition

• Non-competitive Inhibition

• Mixed Inhibition

• Uncompetitive Inhibition

What is the effect of a non-competitive inhibitor on KM and Vmax?

• KM decreases, Vmax increases

• KM increases, Vmax increases

• KM increases, Vmax decreases

• KM decreases, Vmax decreases

What is the purpose of reversible inhibitors?

• Leave enzyme unchanged

• Bind covalently with enzyme

• Interfere with enzyme action

• Destroy enzyme function