C1.1 Enzymes & Metabolism HL

What is the role of enzymes in metabolism?

• D. Enzymes release chemical energy as heat

• C. Enzymes store energy in chemical form

• B. Enzymes are involved in the building of large molecules from smaller ones

• A. Enzymes break down large molecules into smaller ones

What is the effect of temperature on enzyme activity?

• D. Enzymes are not affected by temperature

• C. Enzymes denature at extreme temperatures

• B. High temperatures prevent enzyme reactions

• A. Low temperatures speed up enzyme reactions

How does pH affect enzyme action?

• B. Enzymes denature at neutral pH

• D. Enzymes are not affected by pH

• A. Enzymes work best at all pH levels

• C. Each enzyme has an optimum pH for activity

What happens when enzymes are denatured?

• D. Enzymes increase in activity

• A. Enzymes lose their substrate specificity

• B. Enzymes become more efficient

• C. Enzymes change shape and lose function

How can enzyme activity be measured in an experiment?

• A. By measuring the rate of substrate disappearance

• B. By counting the number of enzyme molecules

• C. By observing the color change of the enzyme

• D. By measuring the enzyme's weight

What happens when the active sites of enzymes become saturated?

• The enzyme denatures

• The reaction rate increases

• The reaction rate decreases

• No further increase in reaction rate

What is the purpose of increasing enzyme concentration in a reaction?

• To stabilize the substrate

• To inhibit the enzyme

• To decrease the rate of reaction

• To increase the rate of reaction

What type of inhibition occurs when a molecule binds to the active site of an enzyme?

• Competitive inhibition

• Non-competitive inhibition

• Mechanism-based inhibition

• Feedback inhibition

How do non-competitive inhibitors affect enzyme activity?

• Increase the rate of reaction

• Decrease the rate of reaction

• Denature the enzyme

• Have no effect on the rate of reaction

What is the mechanism-based inhibition of penicillin?

• It inhibits the end product

• It increases enzyme activity

• It forms covalent bonds with the active site

• It binds to the allosteric site of the enzyme