M9

    Cards (15)

    • FALSE
      Enzymes are large molecules that increase the rates of chemical reaction with themselves undergoing any change.
    • SUBSTRATE = Any substance that is acted upon by an enzyme is called a(n)
    • OPTIMUM TEMPERATURE
      It is the temperature at which the rate of reaction involving the enzyme is at its greatest. 
    • LOCK & KEY model = This representation assumes that the enzyme is a rigid three-dimensional body, which contains an active site that has a restricted opening that only one substrate can fit.
    • TRUE
      Enzymes are mostly globular proteins
    • 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 = maintaining the pH of the reaction at 6.7 
    • At high temperatures, the rate of enzyme action decreases because the increased heat = alters the active site of the enzyme
    • A certain enzyme will hydrolyze egg white but not starch = Enzyme molecules are specific in their actions. 
    • FALSE
      At temperatures above 40°C, the rate of reaction will be faster.
    • environmental condition that has the LEAST effect on the rate of enzyme controlled hydrolytic reactions in humans = the amount of light present 
    • Enzymes influence chemical reactions in living systems by = affecting the rate at which reactions occur 
    • TRUE
      Enzymes cannot make a reaction take place that would not occur without them
    • Increasing this factor results to an initial increase in the rate of activity until it reaches a point after which the rate stays the same = SUBSTRATE CONCENTRATION
    • The "lock and key hypothesis" attempts to explain the mechanism of = ENZYME SPECIFICITY
    • FALSE
      The reactant in an enzyme-catalyzed reaction is the active site.
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