Enzymes and Their Functions

This video tutorial by Mr. Andersen covers the essentials of enzymes, focusing on catalase, an enzyme that breaks down hydrogen peroxide into water and oxygen. The video explains the structure and function of enzymes, including the role of active sites and substrates. It also discusses enzyme activation and inhibition, highlighting the importance of cofactors and coenzymes. The tutorial concludes with a description of a lab experiment using catalase to measure reaction rates.

What is the primary function of the enzyme catalase?

• To synthesize proteins

• To break down hydrogen peroxide

• To transport oxygen in the blood

• To convert glucose into energy

How does an enzyme's active site interact with a substrate?

• By repelling it

• By fitting together like a lock and key

• By changing its chemical structure

• By permanently binding to it

What is competitive inhibition in enzyme activity?

• When an inhibitor binds to the active site

• When a substrate is permanently altered

• When an inhibitor changes the enzyme's shape

• When an enzyme is activated by a cofactor

Which of the following is a type of enzyme activator?

• Inhibitor

• Product

• Substrate

• Cofactor

What role do cofactors play in enzyme activity?

• They are substrates for enzymes

• They are inorganic molecules that activate enzymes

• They are organic molecules that activate enzymes

• They inhibit enzyme function

In an enzyme lab experiment, what is typically measured to determine reaction rate?

• The pH of the solution

• The amount of enzyme used

• The temperature of the reaction

• The amount of product formed

What happens to an enzyme when it denatures?

• It becomes more active

• It speeds up the reaction

• It loses its shape and function

• It binds more substrates

How can the rate of an enzyme-catalyzed reaction be increased?

• By decreasing the enzyme concentration

• By lowering the temperature

• By adding more inhibitors

• By increasing the substrate concentration

What is the effect of temperature on enzyme activity?

• It always decreases activity

• It can increase activity up to a point, then denature the enzyme

• It always increases activity

• It has no effect

What is the purpose of using filter paper disks in an enzyme lab experiment?

• To measure the time it takes for them to float

• To determine the enzyme's molecular weight

• To observe the color change

• To measure the pH of the solution