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#1

10 Questions
#1

A+ Night 1

Questions and Answers
  • 1. 
    Which of the following describes some aspect of metabolism?
    • A. 

      Breakdown of macromolecules

    • B. 

      Control of enzyme activity

    • C. 

      Synthesis of macromolecules

    • D. 

      A&B

    • E. 

      A, B, & C

  • 2. 
    The mathematical expression for the change in free energy of a system is ?G=?H-T?S.  Which of the following is/are correct?
    • A. 

      ?S is the change in enthalpy, a measure of randomness

    • B. 

      ?H is the change in entropy, the energy available to do work.

    • C. 

      ?G is the change in free energy

    • D. 

      T is the temperature in degrees Celsius.

  • 3. 
    Which of the following is true for all exergonic reactions?
    • A. 

      The products have more total energy than the reactants

    • B. 

      The reaction proceeds with a net release of free energy

    • C. 

      Some reactants will be converted to products

    • D. 

      A net input of energy from the surroundings is required for the reactions to proceed

    • E. 

      The reactions are nonspontaneous

  • 4. 
    ATP generally energizes a cellular process by
    • A. 

      Acting as a catalyst

    • B. 

      Coupling free energy released by ATP hydrolysis to free energy needed by other reactions

    • C. 

      Breaking a high-energy bond

    • D. 

      Releasing heat upon hydrolysis

    • E. 

      Binding directly to the substrate(s) of the enzyme

  • 5. 
    Whenever energy is transformed, there is always and increase in 
    • A. 

      Enthalpy of the universe

    • B. 

      Free energy of the universe

    • C. 

      Entropy of the universe

    • D. 

      Free energy of the system

    • E. 

      Entropy of the system

  • 6. 
    Free energy is:  Question: Which of the following would be the same in an enzyme-catalyzed or noncatalyzed reaction? 
    • A. 

      The difference between reactants and products

    • B. 

      D

  • 7. 
    Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier know as the reactions
    • A. 

      Entropy

    • B. 

      Activation Energy

    • C. 

      Endothermic level

    • D. 

      Heat content

    • E. 

      Free-energy content

  • 8. 
    Which of the following statements regarding enzymes is true?
    • A. 

      Enzymes decrease the free energy change of a reaction

    • B. 

      Enzymes increase the rate of a reaction

    • C. 

      Enzymes change the direction of chemical reactions

    • D. 

      Enzymes are permanently altered by the reactions they catalyze

    • E. 

      Enzymes prevent changes in substrate concentrations

  • 9. 
    Which curve was most likely generated from an enzyme that requires a cofactor?
    • A. 

      Look at the tables to see how they are labeled.

    • B. 

      It is not possible to determine because there is a pH and a temp table. (not cofactor table)

  • 10. 
    Does this work?!
    • A. 

      Yes!

    • B. 

      No