Enzymes and Activation Energy Quiz

What is the role of activation energy in a chemical reaction?

• It provides the energy needed to start a reaction.

• It cools down the reactants.

• It increases the temperature of the products.

• It stops the reaction from occurring.

How do enzymes affect activation energy?

• They increase the activation energy required.

• They have no effect on activation energy.

• They lower the activation energy required.

• They eliminate the need for activation energy.

What is a substrate in the context of enzyme activity?

• A product of an enzyme-catalyzed reaction.

• A type of catalyst.

• A specific reactant molecule that an enzyme acts upon.

• A type of enzyme.

What is the active site of an enzyme?

• The site where the enzyme is deactivated.

• The part of the enzyme that binds to the substrate.

• The area where the enzyme is stored.

• The location where the enzyme is produced.

Why is the shape of an enzyme important?

• It determines the enzyme's color.

• It changes the enzyme's pH level.

• It allows the enzyme to fit with specific substrates.

• It affects the enzyme's temperature.

What happens to the substrate when it binds to the enzyme's active site?

• The substrate is released immediately.

• The substrate becomes inactive.

• The substrate changes shape slightly.

• The substrate is destroyed.

What is the result of the enzyme-substrate interaction?

• The enzyme is consumed.

• The substrate is unchanged.

• The activation energy is lowered.

• The activation energy is increased.

What is a catalyst?

• A type of reactant.

• A product of a chemical reaction.

• A substance that speeds up chemical reactions.

• A substance that slows down chemical reactions.

What is the main function of enzymes in cells?

• To transport molecules across the cell membrane.

• To provide energy for the cell.

• To speed up chemical reactions at normal cell temperatures.

• To store genetic information.

How does an enzyme's shape change when a substrate binds to it?

• The enzyme's shape does not change.

• The enzyme becomes inactive.

• The enzyme's shape becomes more rigid.

• The enzyme's active site changes shape slightly to fit the substrate.