本题目来源于试卷: Interaction & Interdependence C.1 Enzymes & Metabolism，类别为 IB生物学
[单选题]
Enzyme A (Enz A) was immobilized on a haq1lf*dt.wxs :+(k l matrix and its activity was compared 7 y31cfyia1wfwith that of a free enzyme in solution. The graph shows the re 7yyc1f1fai w3lative enzyme activity (y-axis) with varying pH (x-axis).
Which of the following statements is true?
I. Both soluble and immobilized enzymes are inactive at higher pH values of 8.
II. The immobilized Enz A is more resistant to pH changes showing more activity than the soluble enzyme at most tested pH values.
III. Immobilizing Enz A did not decrease its catalytic activity.
A. I and II only
B. I only
C. I, II and III
D. I and III only
参考答案: C
本题详细解析:
All three statements are true. Immobilizingtsl6l xyt nt)u 49v3z. the enzyme made it less sensitive to changes in pH since it shows more activity than the soluble enzyme from pH 5.5 to 7.5. Choices A, B and D do not include the6l9xvst . y)u34ntt lz three statements, so they are not correct.
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