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Quiz by Hazlina Zakeri

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20 questions
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  • Q1
    Enzymes influence chemical reactions in living systems by
    affecting the rate at which reactions occur
    combining with excess hydrogen to form gaseous wastes
    providing the substrate required for the reaction to occur
    absorbing water released when polymers are formed
  • Q2
    The "lock and key hypothesis" attempts to explain the mechanism of
    sharing of electrons
    vacuole formation
    enzyme specificity
  • Q3
    An enzyme that hydrolyzes protein will not act upon starch. This fact is an indication that enzymes are
  • Q4
    At high temperatures, the rate of enzyme action decreases because the increased heat
    alters the active site of the enzyme
    neutralizes the acids and bases in the system
    changes the pH of the system
    increases the concentration of the enzyme
  • Q5
    Vitamins are essential to the survival of organisms because vitamins usually function as
    nucleic acids
  • Q6
    Which chemical is classified as an enzyme?
    manganese dioxide
  • Q7
    Salivary amylase is an enzyme in humans that breaks down starch. The optimum pH for this reaction is 6.7. The rate of this reaction would not be affected by
    substrate concentration
    decreasing the temperature of the reaction by 5 degrees C
    maintaining the pH of the reaction at 6.7
    enzyme concentration
  • Q8
    The effect of temperature on the relative rate of action of an enzyme is represented in the graph. The optimum temperature for the action of this enzyme is approximately
    Question Image
    15 degree Celcius
    22 degree Celcius
    37 degree Celcius
    50 degree Celcius
  • Q9
    The diagram represents three steps in the hydrolysis of a molecule of sucrose. In this diagram, structure X is most likely
    Question Image
    an organic catalyst
    a molecule of oxygen
    the substrate
    the end product
  • Q10
    Which statement best describes the enzyme represented in the graphs below?
    Question Image
    This enzyme works best at a temperature above 50 C and a pH above 12
    This enzyme works best at a temperature of 50 C and a pH of 12.
    Temperature and pH have no influence on the activity of this enzyme.
    This enzyme works best at a temperature of 35 C and a pH of 8.
  • Q11
    What happens to an enzyme when it is denatured?
    Activation energy is raised
    It can catalyze more reactions
    Activation energy is lowered
    It loses its shape
  • Q12
    The catalytic efficiency of of two different enzymes can be compared by the
    molecular size of enzymes
    Km value
    pH of optimum value
    formation of product
  • Q13
    An enzyme inhibitor increases the Km value of the enzyme BUT do not affect the Vmax. This type of inhibitor is
  • Q14
    The value of Vmax for the enzyme depicted by curve A is
    Question Image
    10 µmol min-1 mg-1.
    0.5 µM.
    0.1 µmol min-1 mg-1.
    1 µmol min-1 mg-1.
  • Q15
    Curve C depicts the effect of an inhibitor of the system described by curve A. This inhibitor
    Question Image
    is a competitive inhibitor.
    increases the Vmax.
    decreases the Km.
    is a noncompetitive inhibitor.

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