Enzymes

What role do enzymes play in chemical reactions?

• They speed up the rates of reaction

• They permanently change during the reaction

• They reduce the amount of products formed

• They increase the activation energy

Why are enzymes known as biological catalysts?

• Because they can only catalyze biological reactions

• Because they are consumed in the reaction

• Because they lower the activation energy of the reaction

• Because they are only found in living organisms

How do enzymes and substrates interact?

• By changing the shape of the substrate

• By increasing the temperature of the substrate

• By permanently binding to each other

• By moving randomly until they collide at the right speed and orientation

What is the 'lock and key' mechanism?

• A method to lock the enzyme's active site

• A theory that explains how enzymes are destroyed

• A mechanism where the enzyme and substrate fit together perfectly

• A process to synthesize enzymes artificially

What happens to enzymes after the reaction?

• They are destroyed

• They become part of the product

• They are unchanged and can be reused

• They convert into substrates

What is the effect of temperature on enzyme activity?

• Temperature has no effect on enzyme activity

• Decreasing temperature always increases enzyme activity

• Enzymes are most active at freezing temperatures

• Increasing temperature increases activity to a point, then decreases due to denaturation

What is the role of catalase enzymes?

• To synthesize hydrogen peroxide

• To break down hydrogen peroxide into water and oxygen

• To transport hydrogen peroxide out of the cell

• To increase the concentration of hydrogen peroxide

What can affect the rate of enzyme-catalyzed reactions?

• The type of equipment used in the reaction

• Color of the substrate

• Size of the enzyme molecules

• Substrate concentration and presence of products

What is denaturation in the context of enzymes?

• The loss of enzyme's structure and function due to factors like temperature

• The breakdown of the substrate into products

• The removal of enzymes from a solution

• The process of increasing enzyme activity

How are enzymes used in industry?

• To replace substrates in reactions

• In biological washing powders and food processing

• To increase pollution

• To decrease product yield