Enzymes & Metabolism HL Quiz
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How does substrate concentration affect enzyme activity?
A. High substrate concentration speeds up enzyme activity
B. Low substrate concentration denatures enzymes
C. Substrate concentration has no effect on enzyme activity
D. Enzymes work best at all substrate concentrations
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
How does enzyme concentration affect reaction rate?
A. Increasing enzyme concentration decreases reaction rate
B. Decreasing enzyme concentration increases reaction rate
C. Enzyme concentration has no effect on reaction rate
D. Increasing enzyme concentration increases reaction rate up to a certain point
What is the role of enzymes in metabolism?
A. Enzymes release chemical energy as heat
B. Enzymes store energy in chemical form
C.Enzymes are involved in the building of large molecules from smaller ones
D.Enzymes break down large molecules into smaller ones
What happens when the active sites of enzymes become saturated?
A. The enzyme denatures
B. The reaction rate increases
C. The reaction rate decreases
D. No further increase in reaction rate
What is the purpose of increasing enzyme concentration in a reaction?
A. To stabilize the substrate
B. To inhibit the enzyme
C. To decrease the rate of reaction
D. To increase the rate of reaction
What type of inhibition occurs when a molecule binds to the active site of an enzyme?
A. Competitive inhibition
B. Non-competitive inhibition
C. Mechanism-based inhibition
D. Feedback inhibition
How do pH and temperature interact to affect enzyme activity?
A. pH and temperature have independent effects on enzyme activity
B. pH and temperature have a synergistic effect on enzyme activity
C. pH and temperature have opposite effects on enzyme activity
D. pH and temperature do not affect enzyme activity
What is the role of cofactors in enzyme function?
A. Cofactors inhibit enzyme activity
B. Cofactors are not required for enzyme function
C. Cofactors help enzymes maintain their structure
D. Cofactors prevent substrate binding to enzymes
What is the effect of temperature on enzyme activity?
A. Enzymes are not affected by temperature
B. Enzymes denature at extreme temperatures
C. High temperatures prevent enzyme reactions
D. Low temperatures speed up enzyme reactions
How do non-competitive inhibitors affect enzyme activity?
A. Increase the rate of reaction
B. Decrease the rate of reaction
C. Denature the enzyme
D. Have no effect on the rate of reaction
What is the mechanism-based inhibition of penicillin?
A. It inhibits the end product
B. It increases enzyme activity
C. It forms covalent bonds with the active site
D. It binds to the allosteric site of the enzyme
How do allosteric inhibitors affect enzyme activity?
A. They bind to the active site of the enzyme
B. They increase enzyme activity
C. They bind to a site other than the active site, altering enzyme shape
D. They prevent substrate binding to enzymes
What happens when enzymes are denatured?
A. Enzymes increase in activity
B. Enzymes lose their substrate specificity
C. Enzymes become more efficient
D. Enzymes change shape and lose function
What is the effect of substrate specificity on enzyme activity?
A. Enzymes with high substrate specificity can bind to a wide range of substrates
B. Enzymes with low substrate specificity can only bind to a specific substrate
C. Substrate specificity has no impact on enzyme activity
D. Enzymes with high substrate specificity can only bind to a specific substrate
How does pH affect enzyme action?
A. Enzymes denature at neutral pH
B. Enzymes are not affected by pH
C. Enzymes work best at all pH levels
D. Each enzyme has an optimum pH for activity
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