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AP Biology- Photosynthesis Flashcards

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8210464079Photosynthesis6CO2 + 12H20 (light) - > C6H12O6 + 6O2 Process by which plants convert solar energy into energy stored in chemical bonds (light dependent and light independent reactions)0
8210464080Light dependent reactionsUse light directly to produce ATP in the grana (1) Light is absorbed by PS II (2) Photolysis (release O2 and provide electron) (3) Photophosphorylation: Electrons flow through ETC and produce ATP (4) Light is absorbed by PS I (5) NADP+ reduced to NADPH using 2nd ETC Reactants: Light and H2O Products: NADPH, ATP, O2 (released)1
8210464082Noncyclic PhotophosphorylationPrimary form of light-dependent reaction - ATP and NADPH are formed Process begins at PS II and continues to PS I2
8210464083Cyclic PhotophosphorylationForm of light-dependent reaction used to replenish ATP - no NADPH is formed Electrons travel from PS II to PS I and back to PS II again in cyclic fashion3
8210464084Light independent reactions(Dark reactions, Calvin Cycle) Produce sugar using the Calvin cycle4
8210464085Calvin CycleUses ATP and NADPH from light dependent reactions to fix carbon dioxide into G3P (sugar building block) (1) Fixation: CO2 combines with RuBP to produce carbon chain molecules (2) Reduction: carbon chain molecule reduced into G3P using ATP and NADPH (3) Regeneration: regeneration of RuBP for future carbon fixation Occurs in the stroma5
8210464086PigmentsAbsorb light energy to provide energy for photosynthesis Absorb colors that it does not reflect; reflects color that it shows (e.g., chlorophyll a, b, carotenoids)6
8210464087ChloroplastOrganelle site of photosynthesis7
8210464088StromaSite of light-independent reactions8
8210464089Grana(Granum) Consists of thylakoid membranes that are the site of light-dependent reations9
8210464090PhotosystemsHarvest light for light-dependent reactions; Consists of a reaction center containing pigments Located in the grana in the thylakoid membranes10
8210464091PhotorespirationDead-end process where O2 binds to rubisco instead of CO2 in Calvin cycles; does not create sugar or ATP Vestige from ancient Earth, when the atmosphere contained no oxygen to compete with CO211

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