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Photosynthesis Stages

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Photosystem I

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Absorbs light energy to excite electrons, which are eventually used to reduce NADP+ to NADPH.

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Photorespiration

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A wasteful pathway that occurs when RuBisCO oxygenates RuBP, leading to a decrease in photosynthetic output.

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Calvin Cycle (Light-independent reactions)

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Uses ATP and NADPH produced in the light-dependent reactions to synthesize glucose from carbon dioxide.

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ATP Synthase

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An enzyme that creates ATP as protons move down their gradient through it, powering the production of ATP from ADP and inorganic phosphate.

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Reduction Phase

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ATP and NADPH from the light-dependent reactions are used to convert 3-PGA into G3P, a three-carbon sugar.

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Regeneration of RuBP

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Some G3P molecules are used to regenerate RuBP, ensuring the continuity of the Calvin Cycle.

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Light-dependent reactions

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During these reactions, light energy is converted into chemical energy in the form of ATP and NADPH, while water is split to release oxygen.

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C4 Photosynthesis

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An adaptation in some plants that pre-concentrates carbon dioxide at the site of the Calvin Cycle, which minimizes photorespiration.

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Stomata

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Pores found on the leaf surface that allow for gas exchange, opening to allow in carbon dioxide and releasing water vapor and oxygen.

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Carbon Fixation

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The process of converting inorganic carbon dioxide into an organic form (3-PGA) using the enzyme RuBisCO.

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Photosystem II

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Light energy absorbed by chlorophyll excites electrons, which are transferred to an electron transport chain. Water molecules are split to replenish these electrons, releasing oxygen.

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Oxygen Evolution

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The process of generating molecular oxygen (O2) by splitting water molecules.

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Chloroplast Structure

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Chloroplasts have a double membrane system, thylakoids where the light reactions occur, and stroma for the Calvin Cycle.

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CAM Photosynthesis

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An adaptation in some plants where stomata open at night to incorporate carbon dioxide into organic acids, which is later released for use in the Calvin Cycle during the day.

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Electron Transport Chain (ETC)

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A sequence of electron carriers that shuttle high-energy electrons during ATP-generating reactions.

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