BIO 201 Lecture Notes - Lecture 23: Action Spectrum, Photophosphorylation, Photosynthetic Reaction Centre
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14 Apr 2017
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Energy from light is converted to chemical energy (sugar) Stroma: interior of chloroplast (cytoplasm of original cyanobacterium) Light dependent reactions: production of atp and nadph for use in. Light independent reactions (calvin cycle): production of glucose from co2 using atp and nadph from light-dependent reactions. Light-dependent reactions: converting energy from sunlight to chemical energy in the form of nadph and atp: light harvesting, electron transport, photophosphorylation. Sunlight + adp + nadp + h2o -> atp + nadph + o2. Antennae (light-harvesting complex): chlorophylls and other pigments that absorb energy from light and transmit the energy to reaction centers. Reaction center: unique chlorophyll-protein complex that transduces the energy form antennae to electron transport. Photosystem: complex containing the antennae, reaction centers, and other proteins involved in photosynthesis. Action spectrum of plant reflects absorption spectra of multiple pigment. The energy from absorbed light is transmitted to reaction center.
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