D the reaction rate reaches the maximum at the 3rd

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D. The reaction rate reaches the maximum at the 3rd minute because there is no more increase in the amount of oxygen released.
07-08 The same experiment was repeated but the contents were kept at 35°C. Which of the following would best indicate the results of this experiment? Directions: Questions 35 and 36 refer to the graph below, which shows the results of an investigation of an enzyme reaction performed by a group of students:
08-35 Which of the following is the correct explanation for the above results?
08-36 After the investigation, one of the students concluded that the optimum temperature of this enzyme is 40°C. However, another student disagreed with this conclusion. We can verify whether the conclusion is The reaction shown in the graph is A. an anabolic process because energy is absorbed. B. an anabolic process because energy is released. C. a catabolic process because energy is absorbed. D. a catabolic process because energy is released.
correct by repeating the experiment 13-07 Which of the following graphs correctly shows the change in the energy level of the reaction if the enzyme involved is absent?
Past Public Examination Questions on Enzyme and Metabolisms P. 7 / 11 13. Directions: Questions 6 and 7 refer to the graph below, which shows the energy levels of the reactant and product of a biochemical reaction in the presence of its enzyme:
Past Public Examination Questions on Enzyme and Metabolisms P. 8 / 11 Suggested Answers for Past Public Examination Questions on Enzyme and Metabolisms Conventional Questions 1. (i) Gelatin in jelly solution B was digested / disappeared / lost its effect due to the presence of fresh pineapple juice 1 1 (ii) Gelatin was present in solution C, but not in solution B This suggests that the pineapple juice contains protease / enzyme that digests protein or gelatin The enzyme is denatured / activated at high temperature Effective communication (c) (accept alternative answers suggesting that pineapple juice contains a heat-sensitive substance that acts on gelatin) 1 1 1 1 (iii) Beef contains protein which is digested by the protease in the pineapple juice Allowing the beef and pineapple mixture to stand for half an hour will give enough time for the enzyme to work 1 1 1 2. (i) The amylase converts starch into maltose 1 (ii) To ensure that sufficient amount of maltose is produced 1 (iii) When the temperature increases from 0-70 o C, the amylase activity increases When the temperatures increases from 70-90 o C, the amylase activity decreases.

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