Nelson Biology 12 Section 1.4: Enzymes Quiz

28 Questions | Total Attempts: 6710

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Enzyme Quizzes & Trivia

This quiz is based on the content within the Nelson Biology 12 textbook. Enzymes are both proteins and biological catalysts produced by living organisms, and these catalysts accelerate various chemical reactions. This test consists of 28 questions of the same from section 1. 4 of the book.


Questions and Answers
  • 1. 
    • A. 

      True

    • B. 

      False

  • 2. 
    Defined, a catalyst is:
    • A. 

      A substance that speeds up a chemical reaction, but is consumed in the process

    • B. 

      A substance that slows down a chemical reaction, without being consumed in the process

    • C. 

      A substance that speeds up a chemical reaction, without being consumed in the process

    • D. 

      A substance that slows down a chemical reaction, but is consumed in the process

  • 3. 
    In catalyzed reactions, the reactants are converted into products much slower than they would without a catalyst. True or false?
    • A. 

      True

    • B. 

      False

  • 4. 
    What must happen in a reaction for new bonds to be created between the atoms of product molecules?1. Reactant molecules must collide with enough force2. The reactant molecules should be a certain temperature to move accordingly3. Molecules must collide with the correct geometric orientation for bond breaking to occur4. The product molecules must be moving fast enough
    • A. 

      1 and 2

    • B. 

      2 and 3

    • C. 

      1 and 3

    • D. 

      2 and 4

  • 5. 
    Some reactions possess an activation energy barrier that must be overcome for the reaction to occur. True or false?
    • A. 

      True

    • B. 

      False

  • 6. 
    Heat provides the ____________ ____________ for many reactions. It increases the rate of reaction.
  • 7. 
    Why can't living cells use heat to provide the activation energy for their reactions?1. Heat is not readily available to all living cells2. Heat at excessive amounts denatures proteins3. When a critical point of heat level is reached, the proteins and cell can lose their function4. Heat doesn't provide the activation energy for their reactions
    • A. 

      1 and 4

    • B. 

      3 and 4

    • C. 

      1 and 3

    • D. 

      2 and 3

  • 8. 
    Living cells can rely on high levels of heat as a source of activation energy. True or false?
    • A. 

      True

    • B. 

      False

  • 9. 
    ___________________ allow reactions to proceed at suitable rates at moderate temperatures by reducing the activation energy barrier.
  • 10. 
    A catalyst speeds up endergonic and exergonic reactions by heightening the activation energy. True or false?
    • A. 

      True

    • B. 

      False

  • 11. 
    A catalyst speeds up endergonic and exergonic reactions by lowering the activation energy, but it does not change the value of delta G. True or false?
    • A. 

      True

    • B. 

      False

  • 12. 
    Catalysts ________________ the potential energy level of the transition state, and, thus, allow a greater proportion of colliding reactants to reach the transition state and become products.
  • 13. 
    Catalysts work by reducing the activation energy, thereby speeding up forward and reverse reactions at different rates. True or false?
    • A. 

      True

    • B. 

      False

  • 14. 
    Catalysts do not affect the position of equilibrium. True or false?
    • A. 

      True

    • B. 

      False

  • 15. 
    Defined, a substrate is:
    • A. 

      The reactant that an enzyme acts on when it catalyzes a chemical reaction

    • B. 

      The product that an enzyme acts on when it catalyzes a chemical reaction

    • C. 

      A and B

    • D. 

      None of the above

  • 16. 
    The substrate binds to a particular site on the enzyme to which it is attracted. True or false?
    • A. 

      True

    • B. 

      False

  • 17. 
    Enzymes are proteins in tertiary or quaternary structure with simple conformations. True or false?
    • A. 

      True

    • B. 

      False

  • 18. 
    Enzymes are very specific for the substrate to which they bind. True or false?
    • A. 

      True

    • B. 

      False

  • 19. 
    In enzyme-catalyzed reactions, the substrate binds to a very small portion of the enzyme, called the:
    • A. 

      Binding site

    • B. 

      Active site

    • C. 

      Inactive site

    • D. 

      Bonding site

  • 20. 
    The substrate and active site must contain distinctive shapes for binding to occur. True or false?
    • A. 

      True

    • B. 

      False

  • 21. 
    • A. 

      The protein and substrate repel

    • B. 

      The protein changes its shape to accommodate the substrate

    • C. 

      The protein closes off its active site to the substrate

    • D. 

      The substrate enters the active site of the protein, and nothing changes

  • 22. 
    'A model of enzyme activity that describes an enzyme as a dynamic protein molecule that changes shape to better accommodate the substrate' is the definition of the following term:
    • A. 

      Enzyme model

    • B. 

      Substrate model

    • C. 

      Induced-fit model

    • D. 

      Catalyst model

  • 23. 
    The attachment of the substrate to the enzyme's active site creates the:
    • A. 

      Enzyme-substrate complex

    • B. 

      Substrate complex

    • C. 

      Enzyme complex

    • D. 

      Catalyst complex

  • 24. 
    How do enzymes decrease the energy of activation?
    • A. 

      Stretching the chemical bonds

    • B. 

      Bending the chemical bonds

    • C. 

      All of the above

    • D. 

      None of the above

  • 25. 
    Heat energy is provided by the cell's internal environment that helps to bring the substrate molecule to the transition state. True or false?
    • A. 

      True

    • B. 

      False