Practice Questions Enzyme Function and Catalysis

What is the function of an enzyme in a chemical reaction?

• It increases activation energy

• It slows down the reaction

• It lowers activation energy

• It acts as a reactant

What is the specific region on an enzyme where a substrate binds?

• Active site

• Reaction center

• Binding zone

• Catalyst zone

What type of biomolecule are enzymes?

• Lipids

• Proteins

• Carbohydrates

• Nucleic acids

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-6

What happens when an enzyme is denatured?

• It works faster

• It permanently stops working

• It changes shape and loses function

• It becomes more specific to substrates

What is the optimal pH range for most enzymes in the human body?

• 1-3

• 4-5

• 6-8

• 9-12

How does an enzyme’s shape relate to its function?

• The shape determines which substrate it can bind to

• The shape allows it to bind to any molecule

• The shape prevents it from being affected by temperature

• The shape changes randomly in each reaction

Why does increasing temperature initially speed up enzyme activity?

• It increases the number of collisions between enzymes and substrates

• It increases enzyme size

• It removes activation energy

• It permanently strengthens enzyme structure

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

• It is the energy needed to start a reaction

• It is the energy released from a reaction

• It is the energy stored in enzymes

• It prevents reactions from happening

Which factor does NOT affect enzyme activity?

• Temperature

• pH

• Substrate concentration

• Light exposure

What would happen if a stomach enzyme is placed in a neutral (pH 7) environment?

• It would function normally

• It would denature because the pH is too high

• It would denature because the pH is too low

• It would catalyze multiple reactions