Question

quiz!
which of the following graphs best shows the relationship between the reaction rate of an enzyme - catalyzed reaction and temperature?
graphs labeled a, b, c, d are shown
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Explanation:

In enzyme - catalyzed reactions, the relationship between reaction rate and temperature is as follows: At low temperatures, as temperature increases, the kinetic energy of enzyme and substrate molecules increases, so the reaction rate increases. However, enzymes are proteins, and at high temperatures (beyond the optimal temperature), the enzyme will denature, and its active site will be damaged, leading to a decrease in the reaction rate. So the graph should first rise with increasing temperature (up to the optimal temperature) and then fall. Graph C shows this trend: low temperature - slow rate, rate increases with temperature rise to a peak (optimal temperature), then rate decreases as temperature continues to rise (enzyme denaturation). Graph A only shows an increase, Graph B shows a continuous increase without a decrease phase, and Graph D shows a linear increase which is not in line with the actual situation (enzyme denaturation at high temp will cause rate to drop).

Answer:

C