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 pnttfb6ck2x:1+: i0e3 fxuupactiv rb8c3mn/fiekd z nwzff7wu3;34 z/ 9r ity was compared with that of a free enzyme in solution. The graph shows the relative enzyme activity (y-axis) with varying pH (x-ax 3kw/c43nzrd nfz/ emfu 8b w rf9;zi37is).
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 arew, k(btjk3:va true. Immobilizing the enzyme made it less sensitive to changes in pH sincebk3k ,j(wva :t it shows more activity than 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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