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Transcript
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)