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An enzyme was extracted from a mammal - HSC - SSCE Biology - Question 19 - 2013 - Paper 1
Question 19
An enzyme was extracted from a mammal. The graph shows the rate at which bubbles are produced in a reaction at 36°C using the extracted enzyme. 
Answer
At lower temperatures, enzyme activity is generally reduced compared to optimal conditions. Therefore, the reaction rate is expected to be slower at 18°C compared to 36°C. Graph (D) reflects a gradual increase at lower substrate concentrations, which indicates reduced enzyme activity. Hence, the correct answer is (D).