EBIO 1210: Photosynthesis
EBIO 1210: Photosynthesis EBIO 1210
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This 2 page Class Notes was uploaded by Amy Campbell on Sunday October 2, 2016. The Class Notes belongs to EBIO 1210 at University of Colorado at Boulder taught by William Adams, Scott Taylor, Derek Sweeney in Fall 2016. Since its upload, it has received 9 views. For similar materials see General Biology 1 in Biology at University of Colorado at Boulder.
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Date Created: 10/02/16
EBIO 1210: Photosynthesis Photosynthetic ● Energy enters the system as sunlight Autotrophs: ● Solar energy is converted to chemical energy by producers Plants- mostly on land via photosynthesis Photosynthetic Protists- ● Oxygen is needed to release energy from our food. aquatic ● Storing the sun’s energy as energy-rich sugars: Photosynthetic Bacteria- ○ CO2 + H2O+ is converted by photosynthesis to Aquatic C6H12O6 + O2 ● Breaking down sugars for energy: ○ C6H12O6 +O2 is converted by respiration to CO2 + H2O+ Energy for cell Place photosynthesis into ● Father of NASA’s integrative regenerative life support system: the context of energy flow Joseph Priestly, 1771-1772: put mint in a vacuum container between producers and on it’s own, survived. Put mouse in vacuum container on it’s consumers: be able to own, died. Mint and mouse together, both survived, but NOT identify the overall inputs when container is placed in the basement (without sunlight) and outputs of photosynthesis Difference between dissociation of H2O into H+ and OH- and the electron transfer reactions in photosynthesis and respiration Identify the energy done ● During the dissociation of water into OH- and H+ no electrons ATP and the H shuttle are removed from oxygen NADPH as the link ● IN CONTRAST: photosynthesis extracts electrons from water: between light reactions 2H2O to 4 H+ +4 electrons + O2 and cellular respiration and carbon conversion re-combines O2 with 4 electrons to re-form 2H2O reactions of the Calvin ● cycle in photosynthesis. ● The splitting of H2O into H+, O2, and electrons is powered by Locate light reactions and sunlight Calvin cycle to chloroplast ● Sunlight also provides the energy to excite electrons to and grant and storm become high-energy electrons respectively. ● As excited electrons flow through the electron transport chain, they give up energy that is used to power ATP formation; ATP Know the source of is used in the Calvin cycle for sugar formation oxygen produced in ● Sunlight energizes electrons again; energized electrons (and photosynthesis H+) are loaded onto NADP+; the H shuttle NADPH provides high-energy electrons and H+ for the C-H bonds in sugars Identify energy-rich states in photosynthesis Sunlight in photosynthesis 1. Sunlight energizes electrons to High-energy electrons 2. electrons give up energy while flowing through the electron NADPH: transport chain; this energy is captured to energize active Reactive/unstable: doesn’t transport of H+ from low H+ in storm to high H+ inside want electrons… High thylakoids energy electrons. H2O: Unreactive/stable: 3. H+ flow from high concentration within thylakoids to low H+ oxygen wants to keep the concentration in the storm energizes ATP formation electrons… low energy 4. Light energizes electrons again for loading onto NADP+ electrons ● Sunlight provides the energy to convert low-energy electrons to high-energy electrons. Apply the model of ● Between the photosystems, electrons flowing through the hydroelectric dam to electron transport chain give up energy photosynthetic ATP ○ this energy is captured to energize active transport of formation by ATP H+ from low H+ in storm to high H+ inside thylakoids synthase, and identify ● Protons (H+) are pumped from low to high H+ concentration active and passive into the inner thylakoid space (pile up like water behind a transport of H+ in dam) and flow back through the ATP synthase from high to chloroplasts. low H+ concentration, where the energy of the H+ gradient is used to form ATP in the stroma. Protons= “H+" The ATP Synthase= Membrane Structure and Function “turbine" ● outer cell membrane: bring in food & building blocks; eliminate waste; keep out unwanted materials Identify the following as ● Internal membranes of chloroplasts & mitochondria: Platform energy-rich states in for energy transformations via electron transport chains & photosynthesis: excited ATP synthase turbines: electrons; H+ gradient, ○ these membranes act like dams, behind which ATP and NADPH; Sugars protons can be accumulated like water behind a dam.
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