Enzyme Online Lesson

Multiple Choice

Which of the following best describes the primary function of enzymes in biological systems?

• They provide energy for cells

• They make chemical reactions possible

• They store genetic information

• They transport oxygen

Open Ended

Why are enzymes essential for life processes in living organisms?

Multiple Choice

What is the energy required to start a chemical reaction called?

• Activation energy

• Potential energy

• Kinetic energy

• Thermal energy

Multiple Select

Which of the following statements about enzymes are correct?

• Enzymes are proteins.

• Enzymes reduce activation energy.

• Enzymes are changed by the reactions they speed up.

• Enzymes allow chemical reactions to occur in living things.

Open Ended

Explain how enzymes affect the activation energy of a chemical reaction, using the diagrams provided.

Multiple Choice

What is the main difference between a catalyst and an enzyme?

• Catalysts are inorganic, enzymes are biological.

• Enzymes are inorganic, catalysts are biological.

• Both are always proteins.

• Catalysts are changed by the reactions they speed up.

Multiple Choice

What is enzyme specificity?

• The ability of an enzyme to accept only one type of substrate.

• The ability of an enzyme to speed up any reaction.

• The ability of an enzyme to change its shape.

• The ability of an enzyme to act as a catalyst.

Multiple Choice

What does the ES complex represent in an enzyme reaction?

• Enzyme-substrate complex

• Enzyme-product complex

• Enzyme-solution complex

• Enzyme-sugar complex

Multiple Select

Which of the following statements describe the lock and key model of enzyme action?

• The substrate fits into the active site like a key into a lock.

• The enzyme puts stress on the bond, reducing the energy needed to break the substrate.

• The enzyme changes its shape to fit the substrate.

• The products of the reaction leave, making the enzyme available for more substrate.

Open Ended

Explain how enzymes can build molecules using their active sites.

Multiple Choice

In feedback inhibition, what role does the final product of a biochemical pathway play?

• It acts as an inhibitor for the first enzyme in the pathway.

• It acts as a substrate for the first enzyme.

• It speeds up the reaction of the first enzyme.

• It is unrelated to the pathway.

Open Ended

Describe how the concentration of the end-product affects the operation of an enzyme pathway.

Multiple Choice

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Multiple Choice

Letter B...

• active site
• enzyme
• substrate
• products

Multiple Choice

Enzymes catalyze reactions by ___________ Activation Energy.

• Increasing
• Decreasing

Multiple Choice

Looking at the graph, how would you know which reaction took place with the help of an enzyme?

• The peak for the activation energy is lower.

• The peak for the activation energy is higher.

• There is less energy in the products than the reactants.

• There is no way to really tell which line on the graph shows a reaction that takes place with a reaction.