Enzyme Activity and Influencing Factors Quiz

What happens to the reaction rate when enzyme concentration is increased?

• The reaction rate remains constant.

• The reaction rate decreases.

• The reaction rate increases.

• The reaction rate fluctuates randomly.

What is the initial rate of reaction?

• The rate measured after 10 minutes.

• The rate measured after the reaction reaches equilibrium.

• The rate measured after 20 minutes.

• The rate measured at the start of the reaction.

Why is it important to measure the initial rate of reaction?

• To calculate the total reaction time.

• To assess the reaction's speed at the very beginning.

• To understand the reaction's progress over time.

• To determine the final product concentration.

Why does the reaction rate eventually plateau when substrate concentration is increased?

• The substrate concentration decreases.

• The enzyme becomes inactive.

• The reaction reaches equilibrium.

• All active sites on the enzyme are occupied.

What is the role of active sites in enzyme activity?

• They are where substrates are destroyed.

• They are where enzymes are synthesized.

• They are where enzymes are stored.

• They are where substrates bind and reactions occur.

What is the effect of increasing temperature on enzyme-catalyzed reactions?

• The reaction rate increases indefinitely.

• The reaction rate decreases steadily.

• The reaction rate remains unchanged.

• The reaction rate increases to an optimum point and then decreases.

What happens to enzymes at temperatures beyond their optimum level?

• They become more efficient.

• They denature and lose functionality.

• They remain stable and unchanged.

• They catalyze reactions faster.

How does pH affect enzyme activity?

• Enzymes work best at extremely low pH levels.

• Enzymes have an ideal pH at which they function most efficiently.

• Enzymes are unaffected by pH changes.

• Enzymes work best at extremely high pH levels.

What is likely to happen to an enzyme at very low or high pH levels?

• The enzyme catalyzes reactions more efficiently.

• The enzyme becomes more active.

• The enzyme denatures and loses its structure.

• The enzyme remains unaffected.

What is the consequence of enzyme denaturation?

• The enzyme becomes more active.

• The enzyme becomes more stable.

• The enzyme's activity remains unchanged.

• The enzyme loses its ability to catalyze reactions.