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Life Sci 2 - Chapter 8 - James Chyu Cooper Spring `05...

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James Chyu Cooper, Spring ‘05 CHAPTER 8: PHOTOSYNTHESIS: ENERGY FROM SUN Identifying Photosynthetic Reactants and Products - reactants: water, carbon dioxide, light - products: carbohydrates & oxygen gas - 6CO 2 + 12 H 2 O -> C 6 H 12 O 6 + 6 O 2 + 6 H 2 O The Two Pathways of Photosynthesis: An Overview - light reactions: produces ATP & a reduced electron carrier (NADPH + H + ) - Calvin-Benson cycle: uses ATP, NADPH + H+, & CO 2 -> sugars - both process stop in dark because ATP synthesis and NADP+ reduction require light - two pathways linked by exchange & rate of each reaction depends on rate of other ~ light reactions: thylakoids, Calvin-Benson cycle: stoma of chloroplasts The Interactions of Light and Pigments Light behaves as both a particle and wave - shit bout light characteristics, photons, wavelengths, electromagnetic radiation - for photons to be active in biological process: 1. photons must be absorbed by a receptive molecule 2. photons must have sufficient energy to perform the chemical work required Absorbing a photon puts a pigment in an excited state - when photo meets a molecule 1. photon may bounce off molecule (scattered) 2. photon may pass through molecule (transmitted) 3. photon may be absorbed by molecule (...what are you looking here for...*points left*) - shit explainin how molecules go from ground state -> excited state...whooo-ahhh...psshhh - shit bout the visible spectrum & pigments as if we didn't noe what colors were; but I thought...no - few colors pigment absorbs, rest remaining wavelengths (scattered/transmitted) give color Absorbed wavelengths correlate with biological activity - shit bout absorption and action spectrum...as if the tedious lab didn't engrain it in our memory Photosynthesis uses energy absorbed by several pigments - several pigments absorb different wavelengths for energy used in photosynthesis ex: chlorophylls, carotenoids, phycobilins - chlorophyll a & b main type of chlorophyll 1. complex ring structure (similar to heme group of hemoglobin) 2. center of ring is magnesium atom 3. attached at peripheral location is long hydrocarbon "tail" - allows it to adhere to proteins in hydrophobic portion on thylakoid membrane - accessory pigment...dont look at me, tat's how I felt too, blah blah accessory pigment!...? - carotenoids: absorb blue/green wavelengths, appear deep yellow - phycobilins: absorb yellow/green, orange wavelengths, appear...doesn't say...great Light absorption results in photochemical change - shit bout fluorescence...yay...as if we actually thought things "glow in the dark"...stupid
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