3_6_07 - • NADPH and ATP high energy bonds are used to...

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March 6, 2007 Biology 130 Photosynthesis What is the objective of photosynthesis Produces necessary chemicals to grow Convert solar energy to glucose (ATP) and store it Plans are autotrophs ATP does not have a long shelf life Quickly disintegrated, not stable Need to prolong life as storage CO2 glucose Energy rich organic matter from solar energy Be able to store energy long term 6CO2 + 12 H20 and sunlight gives glucose and oxygen and 12 H20 delta G = 686 Kcal/mole endergonic reaction O2 comes from water molecules Light dependant reaction Absorption of light energy Single electron Electron flow Electron need to be replaced to assume continuous flow Photolysis of water to make 2H+ and ½ O2 2H+ and 2 electrons get accepted by coenzyme NADP to make NADPH while electrons flow through ECT onto NADP, a proton concentration gradient is across the thyiakoid membrane. This gradient is used by the ATPase to produce ATP Calvin Cycle (light independent reaction) Stroma, liquid matrix
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Unformatted text preview: • NADPH and ATP high energy bonds are used to fix carbon dioxide into glyceraldehydes 3 phosphate • Used to synthesize glucose, fructose, glycerol, fatty acids, amino acids Plants absorb visible energetic light. Why visible? • If gamma rays, wouldn’t see the plant. They would adapt to the wavelength they absorb • Absorb blues. Plants are green. Don’t absorb green light, reflect it • In the fall o Reabsorb chlorophyll which is left behind are accessory pigments. • Light bounces off onto retina (photo receptors) • Pump protons into the lumen (thylakoid) Photorespiration • When rubisco binds oxygen instead of carbon dioxide – cellular aerobic respiration instead of photosynthesis – creates more carbon dioxide • Know rubisco (rubilose biphosphate) • 10.20 diagram • stomata – stomates must be open all day for long photosynthesis • disadvantage – respire – lose water from open stomates...
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3_6_07 - • NADPH and ATP high energy bonds are used to...

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