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Unformatted text preview: Chapter 24 Photosynthesis Solar energy as the ultimate source of all biological energy Photosynthesis is the two stage process Dark reactions Photosynthesis in plants takes place in chloroplasts • The thylakoids contain the photosynthetic pigments and the enzyme complexes that carry out the light reactions and ATP synthesis • The stroma contains most of the enzymes required for carbohydrate assimilation Architecture of the thylakoids Overview of the light reactions Electromagnetic radiation Primary and secondary photopigments (the primary gatherers of light energy) (The antenna pigments in cyanobacteria and red algae) (The accessory pigments in plants) Absorption spectra of various photopigments Organization of photosystems Resonance energy transfer Light-harvesting complex (LHC) Lycopene chlorophil (primary pigment) (accessory pigment) Mg2+ ion Photosynthetic bacteria have one of two types of single photochemical reaction center
Type II reaction center Type I reaction center Photoreaction center (Type II) In plants, two reaction centers act in tandem Photosystem II O2 is generated by a five-stage water splitting reaction at the oxygen evolving center of PSII Photosystem I Cytochrome b6f complex Plastocyanin transports electrons from cytochrome b6f...
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