During stage 2 of photosynthesis, NADPH is the electron donor for carbon fixation.
Photosynthetic organisms (like plants) convert inorganic carbon into organic compounds through a process known as carbon fixation (carbohydrates). For instance, CO2 fixation, a kind of carbon fixation, involves converting atmospheric carbon dioxide into carbohydrates.
A crucial step in the process of photosynthesis is carbon fixation. Photosynthesis and plant food production would not be possible without the Calvin cycle's carbon fixation process. Because CO2 is "fixed" from its inorganic state into organic molecules, this process is known as carbon fixation. The three-carbon chemical 3-PGA is changed into another three-carbon compound termed G3P by ATP and NADPH using their stored energy.
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