The electrons lost during the oxidation of P700 to P700* are replaced by electrons from NADPH. oxygen. the Calvin cycle. photosystem II. carbon dioxide.
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During the Calvin cycle of photosynthesis carbon dioxide is converted into glucose water is converted into oxygen ATP and NADPH are made from ADP; Pi and NADP+ glucose is broken down into pyruvate and carbon dioxide chemical energy is converted into green light in the chloroplasts
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During the light-dependent reactions of photosynthesis, light energy is indirectly used to split a molecule of water. The electrons from this molecule are then used to replace electrons that have been lost from Photosystem II's P680 reaction center.
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The ATP and NADPH from the light reactions are used to a. split water. b. cause RuBP carboxylase to fix $\mathrm{CO}_{2}$ c. re-form the photosystems. d. cause electrons to move along their pathways. e. convert 3 $\mathrm{PG}$ to G3P.
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