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C3 Cycle

The molecule ...

Question

The molecule which is regenerated in calvin cycle for continuation of cycle is RuBisCo.

A

True

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B

False

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Solution

The correct option is B False
At the end of calvin cycle, the $C O_{2}$ acceptor RuBP or Ribulose 5 phosphate (a 5C compound) is regenerated. This step is essential for the continuation of the Calvin cycle.

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The molecule which is regenerated in calvin cycle for continuation of cycle is RuBisCo.

Q. In each Calvin cycle, how many RuBP molecules are regenerated?

Q. If 9 ATP and 6 NADPH are utilized for photosynthetic carbon assimilation through Calvin cycle, what would be the ratio of erythrose 4- phosphate, xylulose 5- phosphate and ribulose 5- phosphate molecules formed as intermediates in regeneration phase of Calvin cycle?

Q. For fixing one molecule of

C O_{2}

in Calvin cycle, .......... are required.

Q. Consider the following statements and select correct set for photosynthesis in

C_{3}

-plants.
(a) Bifunctional nature of carboxylating enzyme
(b) It takes only one turns of the Calvin cycle to fix one molecule of glucose
(c) Regeneration of each RUBP requires 6 ATP
(d) First stable product of Calvin cycle undergoes phosphorylation in reduction step
(e) Only ATP is required

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