本题目来源于试卷: Interaction & Interdependence C.1 Enzymes & Metabolism，类别为 IB生物学
[单选题]
The Calvin cycle is a ser 40jvx gddohb- 0 cjh21ies of enzyme cat 1b/n7afxxu k* c7 iognl/y f7l2)pz6valysed reactions. A diagram outlining the Calvin cycle is shown x /zv 7balglcxfn2k yu */)p1n7oi7 6f below.
A. It's usually the same enzyme for all steps in one metabolic pathway.
B. The product of one step cannot be the substrate for subsequent steps.
C. Each step of the pathway is catalysed by a different enzyme.
D. All the enzymes are regulated by competitive inhibitors.
参考答案: C
本题详细解析:
Metabolic pathways consist of either a chain or a series of cyclical reactionz+446+db vp yudud+j ds where each reaction is catalysed by a different enzyme.
The same enzyme is not used for each reaction in a metabolic pathway (Choice A).
The product of one reaction or step is the substrate for the next or subsequent step id+ uyzd+ 4juvdp+db 64n the pathway (Choice B).
Although some enzymes are regulated by competitive inhibitors, this is not true for all enzymes in a metabolic pathway (Choice D).
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