Year 12 Bio - Periods 54-55

In the experiment investigating the effect of enzyme concentration, what substance was varied in volume?

• Hydrogen peroxide

• Catalase extract

• Oxygen

• Water

When the enzyme concentration is increased, what generally happens to the initial rate of reaction?

• It decreases.

• It stays the same.

• It increases.

• It becomes zero.

According to Figure 3.11b, what kind of relationship exists between the initial rate of reaction and enzyme concentration?

• Inverse relationship

• Exponential relationship

• Directly proportional relationship

• No relationship

In the experiment on substrate concentration, what was kept constant?

• The volume of hydrogen peroxide.

• The volume of catalase.

• The initial rate of reaction.

• The amount of oxygen released.

What happens to the initial rate of reaction as substrate concentration increases?

• It decreases.

• It stays the same.

• It increases.

• It stops completely.

According to the text, what happens when there is more substrate available for an enzyme?

• The enzyme becomes denatured.

• The enzyme works slower.

• There is a greater chance for substrate molecules to enter an active site.

• The active site changes shape.

What does Vmax represent in the graph showing the effect of substrate concentration?

• The minimum velocity of the reaction.

• The maximum velocity (speed) of the reaction.

• The volume of the substrate.

• The amount of enzyme used.

At very high substrate concentrations, what happens to the enzyme's active sites?

• They become less active.

• They are all occupied.

• They change their shape.

• They start to break down.

When the enzyme is working at its maximum possible rate, what are substrate molecules said to be doing?

• Binding to new active sites.

• Queuing up for an active site to become vacant.

• Denaturing the enzyme.

• Stopping the reaction.

Based on the graphs provided, what is a key difference in the shape of the curve for enzyme concentration versus substrate concentration?

• Enzyme concentration shows a curve that flattens, while substrate concentration shows a straight line.

• Enzyme concentration shows a straight line, while substrate concentration shows a curve that flattens.

• Both show a straight line.

• Both show a curve that continuously increases.