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Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
For the following questions, refer to the diagram below showing 2 models of enzyme action.
____ 1. Which letter represents the enzyme a. A b. B c. C
____ 2. Which letter represents the substrate? a. A b. B c. C
____ 3. Which model represents the "Lock & Key" model of enzyme action? a. Model A b. Model B
____ 4. If a reaction in one direction releases energy, the reaction in the opposite direction a. also releases energy. b. absorbs energy. c. destroys energy. d. cannot occur.
____ 5. Which of the following is a form of energy released during a chemical reaction? a. heat b. sound c. light d. all of the above
____ 6. Which of the following statements about enzymes is NOT true? a. Enzymes work best at a specified pH. b. All enzymes work inside cells. c. Enzymes are proteins. d. Enzymes are organic catalysts.
____ 7. A substance that accelerates the rate of a chemical reaction is called a(an) a. catalyst. b. lipid. c. molecule. d. element.
____ 8. Enzymes affect the reactions in living cells by changing the a. products of the reaction. b. speed of the reaction. c. temperature of the reaction. d. pH of the reaction.
Matching
Match the appropriate chemical reaction type or component with the appropriate phrase. a. Endothermic reaction c. Activation energy b. Exothermic
____ 9. Releases Energy ____ 10. Absorbs energy ____ 11. Is required to initiate many chemical reactions ____ 12. Is often lowered by enzymes ____ 13. The Hindenberg explosion is an example of this
For the following questions, match the letters with the appropriate description of the graph of the energy flow of a chemical reaction shown below.
____ 14. Energy path of an uncatalyzed reaction ____ 15. Energy released from this reaction ____ 16. Activation energy of a catalyzed reaction ____ 17. Activation energy of an uncatalyzed reaction ____ 18. Energy path of a catalyzed reaction