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 matrix and its ,);fstxwa) e r activity was compared wi )+zjys(oh:2i hf a .ptoj pv(/o;j a2:d.iiql th that of a free enzyme in solution. The graph shows t 2sqzhoao:o(pdjji y /:.hip lvj.2a(+i;)f the relative 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. Immobilizing the enzyme madeubx.a2-vc n )l it less sensitive to changes in pH since it shows more activity c) 2val n-bu.xthan the soluble enzyme from pH 5.5 to 7.5. Choices A, B and D do not include the three statements, so they are not correct.
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