13.26) Describe how temperature affects the rate of an enzymatically catalyzed reaction.

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13.26) Describe how temperature affects the rate of an enzymatically catalyzed reaction.
A typical graph of the rate of an enzymatically catalyzed reaction
vs. temperature is shown on the right. Starting at a relatively low
temperature, as the temperature begins to increase there is an
initial increase in the rate of the reaction.
This is the case for both catalyzed and uncatalyzed reactions;
the elevated temperatures provide more energy for reactants to
overcome the activation energy.
As the temperature continues to increase, the reaction rate of an
enzymatically catalyzed reaction reaches a maximum value (the
peak of the graph's curve).
●
The temperature at which the rate of the reaction is greatest is
called the enzyme's optimum temperature. The reason that
the reaction rate does not continue to increase after reaching
the optimum temperature is that the enzyme begins to denature
at the higher temperature.
As the temperature increases past the optimum temperature, the
rate of the reaction quickly decreases.
Reaction Rate
0
10
20
optimum temperature
40
30
Temperature (°C)
50
60
Transcribed Image Text:13.26) Describe how temperature affects the rate of an enzymatically catalyzed reaction. A typical graph of the rate of an enzymatically catalyzed reaction vs. temperature is shown on the right. Starting at a relatively low temperature, as the temperature begins to increase there is an initial increase in the rate of the reaction. This is the case for both catalyzed and uncatalyzed reactions; the elevated temperatures provide more energy for reactants to overcome the activation energy. As the temperature continues to increase, the reaction rate of an enzymatically catalyzed reaction reaches a maximum value (the peak of the graph's curve). ● The temperature at which the rate of the reaction is greatest is called the enzyme's optimum temperature. The reason that the reaction rate does not continue to increase after reaching the optimum temperature is that the enzyme begins to denature at the higher temperature. As the temperature increases past the optimum temperature, the rate of the reaction quickly decreases. Reaction Rate 0 10 20 optimum temperature 40 30 Temperature (°C) 50 60
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