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8.2 Photosynthesis An Overview
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Chlorophyll & Chloroplasts
The wavelengths of the visible spectrum are different colors: red, yellow, green, blue, indigo, violet. Photosynthetic organisms capture energy from sunlight with pigments Chlorophyll reflects green light In the fall, as temperatures drop, chlorophyll molecules break down, making the leaves different colors.
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Chloroplasts contain thylakoids
Chloroplasts contain thylakoids. They are arranged in stacks called grana. The liquid part is called stroma. Chlorophyll absorbs visible light very well. A lot of that light energy is transferred to electrons. These electrons make photosynthesis work.
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High Energy Electrons Electron carrier-compound that can accept a pair of high-energy electrons & transfer them along with most of their energy to another molecule. 1 electron carrier molecule is NADP+. This accepts & holds 2 high-energy electrons & a Hydrogen ion (H+). The NADP+ is converted to NADPH. NADPH carries electrons to other molecules in the body.
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Photosynthesis Uses the energy of sunlight to convert water & carbon dioxide (reactants) into high-energy sugars & oxygen (products) In symbols: 6CO2 + 6H2O C6H12O6 + 6O2 In words: carbon dioxide + water sugars + oxygen
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