Answer :
Final answer:
The first step of the Calvin cycle involves the incorporation of CO2 into RuBP, a process facilitated by the enzyme RuBisCO. The process continues with reduction and finally regeneration, enabling the cycle to continue.
Explanation:
The first step of the Calvin cycle is the incorporation of CO2 into RuBP (ribulose bisphosphate). This process, also known as carbon fixation, is facilitated by the enzyme RuBisCO. Once the carbon dioxide is fixed, the molecule is then reduced in the second stage of the cycle, utilizing energy in the form of ATP and NADPH. This process eventually yields Glyceraldehyde-3- phosphate (GA3P) molecules, which store energy. Finally, RuBP is regenerated in the third stage of the cycle, enabling the process to continue. The cycle must turn multiple times to produce a single glucose molecule, with each turn incorporating only one molecule of CO2.
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