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1. (a) The graph below shows the effect of pH on the activities of three digestive enzymes found in the human body. (i) What are the optimum pH of enzyme A, B and C respectively? (3 marks) (ii) Describe and explain the activity of enzyme A at pH 2.5. (2 marks) (iii) Which of the enzymes (A, B or C) can be found in the stomach (胃)? Explain your answer. (2 marks) (iv) Use a word equation to describe the action of amylase. (3 marks)
