DP Bio SL C1.1-3 review (Enzymes, respiration, photosynthesis)

Which of the following best describes the function of enzymes?

• They permanently alter the products of reactions.

• They are used up in reactions.

• They decrease the activation energy of reactions.

• They provide energy for reactions.

What is the role of enzymes in metabolism?

• They prevent energy loss in metabolism.

• They control the rate of metabolic reactions.

• They slow down reactions to prevent overheating.

• They produce metabolic waste products.

Which type of reaction breaks down macromolecules into monomers?

• Hydrolysis reaction

• Condensation reaction

• Neutralization reaction

• Polymerization reaction

What is the main structural feature of an enzyme's active site?

• A groove containing specific amino acids

• A long chain of amino acids

• A sequence of carbohydrates

• A phosphate group attached to the enzyme

Which model explains the ability of an enzyme to change shape upon substrate binding?

• Lock and key model

• Induced fit model

• Competitive inhibition model

• Non-competitive inhibition model

Which factor is NOT likely to affect enzyme activity?

• Temperature

• pH

• Substrate concentration

• Cell size

Why does increasing temperature initially increase enzyme activity?

• It increases the number of enzyme-substrate collisions.

• It stabilizes the enzyme’s structure.

• It changes the enzyme’s active site permanently.

• It speeds up ATP synthesis.

What happens to an enzyme when it denatures?

• Its amino acids change sequence.

• It loses its three-dimensional shape.

• Its active site becomes more reactive.

• Its enzyme-substrate complex becomes permanent.

Which of the following is true about enzyme-substrate collisions?

• They occur randomly with no pattern.

• They only occur when there is a high concentration of substrate.

• They increase when temperature decreases.

• They occur more frequently at higher temperatures.

How does pH affect enzyme activity?

• pH does not affect enzyme activity.

• pH changes can alter the enzyme’s shape.

• pH changes alter substrate concentration.

• pH changes affect the bonds in the enzyme.