本题目来源于试卷: Interaction & Interdependence C.3 Photosynthesis，类别为 IB生物学
[单选题]
The following processes occur in the Calvin s. fu-+gllf/to -7glg fzft;c 8vjkt8/ p;:zwcycle.
I. Ribulose bisphosphate regeneration
II. Carbon dioxide fixation
III. Glycerate-3-phosphate is reduced to triose phosphate
Which is the incorrect sequence for these processes?
A. I. → II. → III.
B. I. → III. → II.
C. II. → III. → I.
D. III. → I. → II.
参考答案: B
本题详细解析:
B In the Calvin cycle, there are four important stages. Firstly, the fixation of carbon dioxide (Option II) where ribulose bisphosphate is carboxylated by a Rubisco enzyme. Carbon fixation is followed by the reduction of glycerate-3-phosphate to triose phosphate (Option III) using reduced NADP and ATP. Finally, the regeneration of the acceptor compound, ribulose bisphosphate (Option I) which uses triose phosphate and ATP. The starting point in the Calvin cycle is arbitrary because it is a cyclic process. Thus all answer choices except Choice B show the correct order of events in the Calvin cycle.
| 
