Question

mini-quiz: temperature and enzymes
what is the optimal temperature for the enzyme shown below?
a. 40 degrees celsius
b. 20 degrees celsius
c. 30 degrees celsius
d. 60 degrees celsius
rate of enzyme-catalyzed reaction at
varying temperatures
temperature (°c) 10 20 30 40 50 60
rate of reaction: slow to fast
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Explanation:

The optimal temperature for an enzyme is where the rate of the enzyme - catalyzed reaction is the highest. Looking at the graph "Rate of Enzyme - Catalyzed Reaction at Varying Temperatures", the peak of the curve (highest reaction rate) occurs around 40 degrees Celsius. So we compare the options:

• Option A: 40 degrees Celsius matches the temperature at the peak of the reaction rate curve.
• Option B: 20 degrees Celsius has a lower reaction rate than at 40 degrees.
• Option C: 30 degrees Celsius also has a lower reaction rate than at 40 degrees.
• Option D: 60 degrees Celsius has a very low reaction rate (near zero as per the graph).

Answer:

A. 40 degrees Celsius