Which processes occurs during the calvin cycle?

The Calvin cycle has four main steps: carbon fixation, reduction phase, carbohydrate formation, and regeneration phase. Energy to fuel chemical reactions in this sugar-generating process is provided by ATP and NADPH, chemical compounds which contain the energy plants have captured from sunlight.

Explanation:

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genewho genewho · Answer 2 · 2021-10-14T13:38:42+02:00

The Calvin cycle consists of the reduction of CO2 molecules to form carbohydrates by means of the energy sources (ATP) and the reducing source (NADPH) obtained in the clear stage, it comprises the following processes:

Fixation of CO2, the enzyme RuBisCo catalyzes the carboxylation of ribulose diphosphate, that is, the binding of carbon dioxide to form PGA (3-Phosphoglyceric Acid).

Reduction of PGA to a sugar (CH2O) through the formation of glycealdehyde-3-phosphate (GAP) with NADPH (Nicotidamide adenine dinucleotide phosphate) and ATP (Adenosine Triphosphate) produced in light-dependent reactions.

Ribulose diphosphate regeneration, which requires ATP as well.

During this process, condensations, hydrolysis and rearrangements take place, finally ribulose monophosphate is formed, which by spending ATP, is phosphorylated to ribulose diphosphate, which closes the cycle.

Therefore, we can conclude that the Calvin cycle comprises the processes of CO2 fixation, reduction of PGA to a sugar, and regeneration of ribulose diphosphate.

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