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Chapter 8

chapter 8 notes

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Biological Sciences
Course Code
Rick Halpern

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Chapter 8 Light Energy Photosynthesis Electromagnetic energy is absorbed by all molecules Life depends on absorption of light energy from sun Pigments absorb light in visible spectrum (400 700nm) not very efficient ~ 4% of light actually used Photosynthetic Pigments process responsible for aerobic oxygenic most common pigment in all atmosphere photoautotrophs is chlorophyll occurs in photoautotrophic organisms plants, some algae an cyanobacteria havechlorophyll a Site of photo synthesis Absorbtion in blue (400-450 nm) and red In internal membranes in prokaryotes (650-700 nm) In chloroplast in Eukaryotes Chlorophyll appears green because it reflects Photosynthetic Process green wavelengths (500 to 600 nm) involves light (photo) reactions and Accessory Pigments dark (synthesis) reactions include carotene, phycocyanin, traps energy from sunlight into bonds phycoerythrin, xanthophylls
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