Midterm II - Chemical Catalysis

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Yasham
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113242
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Midterm II - Chemical Catalysis
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2011-10-31 18:01:54
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Midterm II Chemical Catalysis
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Midterm II - Chemical Catalysis
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  1. How many polypeptide chains are present in myoglobin?
    1
  2. How many polypeptide chains are present in hemoglobin?
    4
  3. How many polypeptide chains are present in IgG?
    4
  4. How many polypeptide chains are present in IgM?
    21
  5. How many polypeptide chains are present in myosin?
    6
  6. How many polypeptide chains are present in G-actin?
    1
  7. How many polypeptide chains are present in lysosyme?
    1
  8. What is the chemical reaction catalyzed by myosin?
    ATP + H20 -> ADP +Pi
  9. What chemical reaction is catalyzed by lysosyme?
    (NAM-NAG)n-NAM-NAG-(NAM-NAG)m + H20 -> (NAM-NAG)n-NAM + NAG-(NAM-NAG)m
  10. What chemical reaction is catalyzed by trypsin?
    ~CHR-CO-NH-CHR'~ + H20 -> ~CHR-COO- + NH3+-CHR'

    Where R is Lys (K) or Arg (R)
  11. What chemical reaction is catalyzed by chymotrypsin?
    ~CHR-CO-NH-CHR'~ + H20 -> ~CHR-COO- + NH3+-CHR'

    Where R is Phe (F), Trp (W), or Tyr (Y)
  12. What chemical reaction is catalyzed by alcohol dehydrogenase?
    CH3CH2OH + NAD+ -> NADH + H+ +CH3CHO
  13. What chemical reactions are catalyzed by alpha-amylase?
    Amylose (amylopectin, glycogen) + H20 -> glucose + maltose
  14. What chemical reactions are catalyzed by Ribonuclease A?
    RNA + H2O -> NMPs
  15. What is the catalytic triad found in serine proteases?
    • Asp-102
    • His-57
    • Ser-195
  16. What chemical reactions are catalyzed by carbonic anhydrase?
    CO2 +H2O -> COOOH- + H+
  17. What are the active residues in lysozyme?
    Glu (E) and Asp (D)
  18. How many steps does RNase A's mechanism consist of? What are the functional amino acid residues?
    • Two.
    • Two histidines (one protonated, one deprotonated)
  19. What are the following relations for competitive inhibition?
    Vmax-app
    Km-app
    Ki
    • Vmax-app = Vmax
    • Km-app = a(Km)
    • Ki=[I]/(1-a)
  20. What are the following relations for uncompetitive inhibition?
    Vmax-app
    Km-app
    Ki
    • Vmax-app = Vmax/a'
    • Km-app = Km/a'
    • Ki = [I]/(1-a')
  21. What are the following relations for noncompetitive inhibition?
    Vmax-app
    Km-app
    Ki
    • Vmax-app = Vmax/a'
    • Km-app = (a/a')Km
    • Ki = [I]/(1-a)
    • Ki' = [I]/(1-a')

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