Enzymes

Mr. Anderson introduces enzymes, focusing on catalase, which breaks down hydrogen peroxide into water and oxygen. He explains enzyme structure, including active sites, and discusses enzyme activation and inhibition. The video also covers a lab experiment using catalase to measure reaction rates, highlighting factors like enzyme concentration, temperature, and pH that affect enzyme activity.

What is the primary function of catalase in cells?

• To convert oxygen into water

• To produce hydrogen peroxide

• To break down hydrogen peroxide

• To synthesize proteins

How does the active site of an enzyme function?

• It binds to the substrate like a lock and key

• It consumes the substrate

• It changes the substrate into a different enzyme

• It provides energy for the reaction

What is competitive inhibition in enzyme activity?

• A substrate binding to the enzyme

• An inhibitor binding to the active site

• An enzyme changing its shape

• A coenzyme activating the enzyme

Which of the following is an example of a cofactor?

• ATP

• Thiamine

• Heme

• Glucose

What is the role of coenzymes in enzyme activity?

• They are inorganic molecules that activate enzymes

• They are organic molecules that assist enzyme function

• They are enzymes that inhibit reactions

• They are proteins that denature enzymes

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

• The amount of enzyme used

• The temperature of the reaction

• The amount of products formed

• The color change of the solution

What happens to an enzyme when it denatures?

• It becomes more active

• It loses its shape and function

• It binds more substrates

• It produces more products

How does temperature affect enzyme activity?

• It can increase activity up to a point before denaturing the enzyme

• It decreases enzyme activity

• It always increases enzyme activity

• It has no effect on enzyme activity

What is the independent variable in the enzyme lab experiment described?

• The amount of enzyme

• The amount of substrate

• The pH level

• The temperature of the reaction

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

• To increase the reaction rate

• To measure the pH of the solution

• To observe the color change

• To measure the time it takes for them to float