Understanding Enzyme-Controlled Reactions

What happens to the rate of an enzyme-controlled reaction as the substrate molecules decrease?

• The rate increases.

• The rate remains constant.

• The rate decreases.

• The rate becomes unpredictable.

How can you determine the rate of reaction at a specific point on a graph?

• By finding the midpoint of the curve.

• By counting the number of peaks.

• By drawing a tangent to the curve.

• By measuring the area under the curve.

What is the purpose of drawing a tangent line on a reaction rate graph?

• To identify the endpoint of the reaction.

• To determine the initial concentration of substrate.

• To find the total amount of product formed.

• To calculate the rate of reaction at a specific time.

What does a high frequency of successful collisions between substrate molecules and the active site indicate?

• A reaction that has stopped.

• A constant reaction rate.

• A rapid initial reaction rate.

• A slow reaction rate.

Why does the reaction rate slow down as the reaction proceeds?

• The temperature decreases.

• The enzyme becomes inactive.

• The pH level changes.

• The substrate molecules are used up.