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UC Berkeley Extension Online 1) Enzymes can increase the rates of
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  1. 1)  Enzymes can increase the rates of reactions over a million fold but they do not accomplish this by
    1. a)  Lowering the activation energy of the reaction
    2. b)  Changing the equilibrium of the reaction
    3. c)  Highly specific binding of substrates
    4. d)  Stabilizing the transition state
    5. e)  Conformation changes accompanying catalysis
    6.  
  2. 2)  For an enzyme catalyzed reaction at equilibrium, what is the Keq if the concentrations of product is 0.5 mM and concentration of substrates are 6.5 mM and 3.0 mM?
    1. a)  3.9 x 10-3
    2. b)  2.56 x 10-2
    3. c)  167
    4. d)  25.6
    5. e)  2560
  3. 3)  What would be the standard Gibbs free energy of the above reaction at 37 oC? (R = 8.3 J oK?1 mol?1, oK = 273 + oC)
    1. a)  -8.34 kJmol-1
    2. b)  8.34 kJmol-1
    3. c)  -4.1 kJmol-1
    4. d)  4.1 kJmol-1
    5. e)  -20 kJmol-1
  4. 4)  An allosteric protein would be expected to
    1. a)  Be a multisubunit protein
    2. b)  Have different binding sites for substrates and effector molecules
    3. c)  Exhibit non Michaelis-Menton kinetics
    4. d)  Be found at committing steps in metabolic pathways
    5. e)  All of the above
  5. 5)  Allosteric proteins and the regulation of metabolic pathways would be expected to be found at __________________________ and ______________________ of metabolic pathways
    1. a)  Steps with large free energy changes
    2. b)  The beginning
    3. c)  Branchpoints
    4. d)  AandB


 







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