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Lecture 8

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Biology 1002B
Tom Haffie

Photosynthesis 773Photosynthetic organisms are photoautotrophs and are classified as the primary producers of the earthPhotosynthesis is the major biological process that allows for energy to enter biosphere importantChlorophyll is abundance in aquatic and land environmentso Aquatic environments that are very cold are photosynthetic hotspots not those that are hotTwo parts of photosynthesis Light dependent reaction and light independent reaction Calvin cycleTransforming light energy into chemical energy sugar Takes place in chloroplastsDefinition The light dependent conversion of CO 2inorganic carbon into an organic form Carbon Dioxide vs SugarMetabolic process Light dependent conversion of COinorganic into 2 organic formNo useable energy in CO 2o Can get electrons away from moleculeoxygen too electronegative Sugar o Lots of usable energy o Calories o CH bondsnot electronegative easier to pull electrons away and therefore work can be done Photosynthesis is an endergonic reaction as potential energy goes up Energy comes from lightRedox ProcessPhotosynthesis is a redox reaction in which water is oxidized carbon dioxide is reduced o The Light Reactions o Calvin CycleOccurs in granaSplit waterOccurs in stroma Release oxygenForms sugar from CO 2 Produce ATP Use ATP for energy andForm NADPH NADPH electron source Powered by energy of the for reducing power from sun light reactions
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