Enzymes usually function best at an optimal pH and temperature. The following graph shows the effectiveness of two enzymes at various temperatures. (a) At which temperature does enzyme A perform best? Enzyme B?

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1. Examine the graph to understand the relationship between temperature and the rate of reaction for both enzymes.
2. Identify the peak of the curve for Enzyme A, which represents the temperature at which Enzyme A performs best.
3. Identify the peak of the curve for Enzyme B, which represents the temperature at which Enzyme B performs best.
4. Note the temperature value on the x-axis corresponding to the peak of Enzyme A's curve.
5. Note the temperature value on the x-axis corresponding to the peak of Enzyme B's curve.