Exploring Enzyme Function and Inhibition

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 active site and substrate interaction. It also discusses enzyme activation and inhibition, highlighting competitive and allosteric inhibition. The tutorial concludes with a description of a lab experiment using catalase to measure reaction rates, emphasizing the importance of enzyme concentration, temperature, and pH in enzyme activity.

What is the primary function of enzymes in biological reactions?

• To consume reactants

• To store energy

• To speed up reactions without being consumed

• To create new reactants

Which enzyme is specifically mentioned as breaking down hydrogen peroxide?

• Catalase

• Sucrase

• Lipase

• Amylase

What are the products of hydrogen peroxide decomposition catalyzed by catalase?

• Oxygen and glucose

• Hydrogen and oxygen

• Water and oxygen

• Water and carbon dioxide

What role does the active site of an enzyme play?

• It is where the substrate molecules bind

• It binds to inhibitors to prevent reaction

• It stores the enzyme until needed

• It repels the substrate molecules

What is meant by 'competitive inhibition' in enzyme activity?

• An inhibitor competes with the substrate for the active site

• The enzyme competes with the substrate to stop the reaction

• Substrates compete with each other to bind to the enzyme

• Enzymes compete with each other to bind to substrates

What is an example of a cofactor?

• Thiamine

• Heme

• Glucose

• Fructose

What is the role of coenzymes in enzyme functionality?

• They are inorganic molecules that bind to enzymes

• They prevent the enzyme from binding to substrates

• They decrease the enzyme's activity

• They are organic molecules that assist enzymes

How does allosteric inhibition differ from competitive inhibition?

• It involves the substrate binding directly to the active site

• It changes the shape of the enzyme's active site

• It only occurs in prokaryotic cells

• It speeds up the reaction

In the enzyme lab, what is the independent variable?

• The pH of the solution

• The concentration of the enzyme

• The temperature of the solution

• The time it takes for disks to float

What does measuring the rate of reaction in an enzyme lab involve?

• Observing the color change in the solution

• Measuring the amount of products formed

• Calculating the weight of the reactants

• Counting the number of substrate molecules