• Carbon enters the Calvin cycle as CO2 and leaves as sugar. In stage 2, the organic molecule is reduced using electrons supplied by NADPH. NADPH is made by.....? Instead, it supplies energy — stored in the ATP and NADPH — that gets plugged into the Calvin cycle. This is where sugar is made. In the second stage of C3 cycle, ATP and NADPH reduce 3PGA to G3P. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue. The reduction equivalents (NADPH) and ATP produced in the light reactions of photosynthesis are used for CO 2 assimilation in the Calvin (Calvin-Benson) cycle (so-called dark reactions or light-independent reactions).The principles of CO 2 fixation by the so-called C 3 pathway in chloroplasts are shown in Fig. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule, 3-PGA. NADPH oxidase (nicotinamide adenine dinucleotide phosphate oxidase) is a membrane-bound enzyme complex that faces the extracellular space. These six turns require energy input from 12 ATP molecules and 12 NADPH molecules in the reduction step and 6 ATP molecules in the regeneration step. b) glycolisis. d) calvin cycle. NADPH is the blend of energy that is released while Calvin Cycle, it is the product of CO2 fixation during Calvin Cycle that is the very second phase of photosynthesis. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue. How light energy is used to make ATP and NADPH. It is crucially a form of chemical energy which is released by the light-dependent reaction. It can be found in the plasma membrane as well as in the membranes of phagosomes used by neutrophil white blood cells to engulf microorganisms. e) passing of electrons from photosystem 1 to an electron transport chain. The ATP and NADPH also will take part in the synthesis part of photosynthesis. a) chemiosmosis. c) krebs cycle. • ATP is the energy source, while NADPH is the reducing agent that adds high-energy electrons to form sugar. Figure: The Calvin Cycle: The Calvin cycle has three stages. ive ruled out b and c, but im not sure what it is? absorption of sunlight, electrons flow down the electron transport chain, NADPH is made, water is split The calvin cycle occurs in the stroma surrounding the … … Answer Save. In the first stage of Calvin cycle, the light-independent reactions are initiated and carbon dioxide is fixed. Both of these allow a cell to store energy. In summary, it takes six turns of the Calvin cycle to fix six carbon atoms from CO 2 . What is NADPH? • The Calvin cycle is similar to the Krebs cycle in that the starting material is regenerated by the end of the cycle. However, the first phase is the light dependent reaction. Photosystems I and II. 1 Answer. 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