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by: Madisen Robel
Madisen Robel

GPA 3.99

Barbara Demmig-Adams

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Barbara Demmig-Adams
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This 3 page Study Guide was uploaded by Madisen Robel on Thursday October 29, 2015. The Study Guide belongs to EBIO 1210 at University of Colorado at Boulder taught by Barbara Demmig-Adams in Fall. Since its upload, it has received 30 views. For similar materials see /class/231854/ebio-1210-university-of-colorado-at-boulder in Ecology, Evolution, and Marine Biology at University of Colorado at Boulder.

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Date Created: 10/29/15
Photosynthesis Study Guide Location within the chloroplast of light reactions versus the conversion of carbon dioxide to sugars in the Calvin cycle Principal roles of light reactions and Calvin cycle and what serves as the connection between these two parts of photosynthesis Source of oxygen produced in photosynthesis and reason why water is split Principle of how ATP is formed in chloroplasts and mitochondria Ecological advantages of C3 versus C4 plants Suggested Readings from the Textbook Campbell and Reece s BIOLOGY Seventh Edition corresponding to lectures on Photosynthesis Chapter 10 Photosynthesis Overview pp 181182 Concept 101 Photosynthesis converts light energy to chemical energy of food Only Chloroplasts The sites of photosynthesis pp 182183 and The two stages of photosynthesis A preview pp 184185 Concept 102 The light reactions convert solar energy to the chemical energy of ATP and NADPH Only A photosystem A reaction center associated with lightharvesting complexes pp 189190 and A comparison of chemisomosis in chloroplast and mitochondria pp 192193 Concept 104 Alternative mechanisms of carbon xation have evolved in hot arid climates Only C4 plants p196 and The importance of photosynthesis A review pp 197198 Photosynthesis Figures 14 92 102 and 103 Plant photosynthesis occurs in chloroplasts Most chloroplasts are found in leaves Chloroplasts have Inner membranes thyakoids often stacked light reactions light collection by chlorophyll plus electron transport chain Fluid space stroma around inner membranes conversion of CO2 to sugars in the Calvin cycle Overview of Photosynthesis Fig 105 Light collection and use ofthis light energy to produce energyrich ATP and NADPH CO2 is converted to energyrich sugar using this ATP and NADPH O C 0 CO2 l to H C OH CHOH6 CBH1206 sugar I What s needed Additional H electrons protons 1 H provided by electron carrier NADPH 2 energy for the reaction provided by ATP Back to Fig 105 Light collection solar energy used to strip electrons from water energize the electrons make ATP amp pass energized electrons to NADP to form NADPH Fig 1012 How does solar energy produce energized electrons Many chlorophyll molecules absorb light energy and pass it on to a special chlorophyll that gives up an electron This chlorophyll then gets an electron back from a water molecule leaving behind H and O2 Figs 1017 amp 1016 Electron transport and ATP formation The whole process within the context ofthe internal chloroplast thylakoid membranes Fig 1021 Overview of photosynthesis with more detail Fig 1019 Most plants just use the Calvin cycle They are called C3 plants since the rst stable product of CO2 xation is a 3carbon product phosphoglycerate Some plants use an additional CO2 fixation step before the Calvin cycle They are called C4 plants since their rst product of CO2 fixation is a 4carbon product oxaloacetate The grasses like switchgrass discussed as new biofuel crops for cellulosic ethanol production are C4 plants the rapidly growing tree hybrid poplar discussed as another new biofuel crop is a C3 plant Advantage of C4 plants In hot dry sunny climates and under nutrient limitation CO2 xing enzyme in C4 cycle PEP carboxylase is more efficient than the CO2 xing enzyme ofthe Calvin cycle RUBP carboxylase C4 plants need less water are able to x a lot of CO2 with stomates open less widely and less nitrogen fertilizer Advantage of C3 plants In cool moist less sunny climates Typically are more coldtolerant C3 plants need less energy since they don t run two cycles


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