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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)