QUIZ #: ______________ ID: A
DO NOT WRITE ON EXAM
1
L2 Biology: Energy & Enzymes
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.
