Two Stages of Photosynthesis
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Photosynthesis runs in two linked stages: light-dependent reactions convert light energy into stored chemical energy, and light-independent reactions use that energy to build sugar.
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The light-dependent reactions occur in the thylakoid membrane; the light-independent reactions occur in the stroma, per Bio 0273's chloroplast structure.
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The light-independent reactions need no light directly, but cannot run without the products the light-dependent reactions already supplied.