Select all of the following in which carbon fixation is separate from the Calvin cycle.Group of answer choicesC4 photosynthesisC3 photosynthesisCAM photosynthesisNext
Question
Select all of the following in which carbon fixation is separate from the Calvin cycle.Group of answer choicesC4 photosynthesisC3 photosynthesisCAM photosynthesisNext
Solution
In both C4 photosynthesis and CAM photosynthesis, carbon fixation is separate from the Calvin cycle.
In C4 photosynthesis, carbon fixation and the Calvin cycle occur in different cells. The carbon fixation happens in mesophyll cells, where CO2 is converted into a four-carbon compound. This compound is then transported to bundle-sheath cells, where it is decarboxylated to release CO2, which then enters the Calvin cycle.
In CAM photosynthesis, carbon fixation and the Calvin cycle occur at different times. The carbon fixation happens at night, where CO2 is converted into a four-carbon compound to prevent water loss. This compound is stored in the vacuoles of the cells until daylight, when it is decarboxylated to release CO2 for the Calvin cycle.
In contrast, C3 photosynthesis does not separate these processes. The carbon fixation and the Calvin cycle both occur in the same cells at the same time.
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