Enzymes Quiz

What is the main function of enzymes?

• Act as catalysts

• Consume during reactions

• Decrease reaction velocity

• Increase the rate of chemical reactions

What is the active site of an enzyme?

• A site where denaturation occurs

• A location for enzyme storage

• A region where the enzyme is consumed

• A special pocket or cleft where the enzyme forms an enzyme-substrate complex

Which factor affects the reaction velocity of enzymes by increasing the vibrational energy of substrates?

• Substrate concentration

• Temperature

• Competitive inhibitors

• pH

What happens to the reaction velocity of enzymes when the temperature is further elevated beyond the optimal range?

• Increases

• Remains constant

• Stops completely

• Decreases due to denaturation of the enzyme

How do extremes of pH affect enzyme activity?

• Enhance enzyme activity

• Lead to denaturation of the enzyme

• Have no effect

• Increase substrate concentration

What type of inhibition occurs when an inhibitor competes with a substrate for binding at the active site?

• Irreversible inhibition

• Competitive inhibition

• Reversible inhibition

• Non-competitive inhibition

Which enzyme is competitively inhibited by Allopurinol?

• Epoxide reductase

• Xanthine oxidase

• HMG-CoA reductase

• Alanine aminotransferase

What is the medical importance of Dicumarol and Warfarin?

• Used as anticoagulants

• Used in lowering plasma cholesterol levels

• Used for treatment of Gout

• Used as bacteriostatic antibiotics

In clinical diagnosis, elevated enzyme activity in plasma may indicate what?

• Tissue damage with increased release of intracellular enzymes

• Normal cell turnover

• Presence of physiologic use in the plasma

• Decreased enzyme activity

Which enzyme is abundant in the liver and signals possible damage to hepatic tissue when elevated in plasma?

• Xanthine oxidase

• Alanine aminotransferase

• Epoxide reductase

• HMG-CoA reductase