Plenary on Unit 5 - Enzymes

A catalyst is a chemical that

• blocks a chemical reaction from occurring

• speeds up the rate of a chemical reaction

• slows down a chemical reaction

• has no effect on a chemical reaction

2. Object C in this image is know as the ________

• enzyme

• substrate

• enzyme-substrate complex

• product

3. The chemical an enzyme reacts with is known as the

• reactant

• substrate

• product

• enzyme

4.  Enzymes are

• Nucleic acids

• Lipids

• Proteins

• Carbohydrates

5. 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.

• Enzymes reverse the direction of the reaction.

• Enzyme decrease the activation energy of the reaction.

6. At high temperatures, the rate of enzyme action decreases because the increased heat......

• neutralizes the acids and bases in the system

• increases the concentration of the enzyme

• alters the shape of the active site of the enzyme

• changes the pH of the system

7. Both enzymes will have the same amount of activity at 40 degrees Celsius?

• True

• False

8. After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

• a substrate

• a product

• an enzyme

• an active site

9. How does an enzymes shape relate to its function?

• the shape of the enzyme has no relation to its function

• the enzyme shape acts as a receptor to certain products

• the enzyme is shaped specially for certain substrates to perform a specific reaction

• the enzyme shape can fit into specific substrates to cease a reaction

10. Enzymes will make a reaction go _______ and use ______ energy.

• faster, less

• slower, less

• faster, more

• slower, more