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lecture 9 (10-11)

lecture 9 (10-11) - Lecture 9 Plant Photosynthesis CO2...

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Lecture 9 – Plant Photosynthesis CO 2 – PLANT Conversion of light Energy to chemical bond Energy I. Light A. Electromagnetic Energy Figure 9-2 1. Electromagnetic spectrum 2. Waves 3. Wavelength a. Distance of one peak to another b. Gamma rays- short wavelength i. High energy c. X-Rays i. Lower energy d. UV rays e. Visible light i. Violet- 380 nanometer ii. Red- 760 nanometers f. Infrared waves g. Microwaves h. Radio waves- long wavelengths; low Energy B. Light comes to us in Photons 1. Photon- small particle of light Energy 2. Amount of energy in photon is inversely proportional to its wavelength C. Biological processes 1. Use visible light because there is enough energy to be useful but not so energetic that it would be destructful D. Molecule absorbs photon 1. Electron energized 2. Electron may either a. Return to lower orbital (ground state) and either i. Energy heat ii. emit light of longer wavelength than absorbed light (fluorescence) b. Energized electrons leave atom i. captured by an acceptor (acceptor becomes reduced) Figure 9-3 II. Chloroplasts A. Light energy chemical bond Energy (simple sugar) B. Eukaryotes C. Structure 1. 3 membrane system a. inner membrane Figure 9-4b b. outer membrane c. thylakoid (sacs) d. thylakoid membrane e. thylakoid lumen (inner part) f. granum- stacks of the thylakoid g. stroma - fluid D. Photosynthetic Pigment 1. Light hits matter a. light may be absorbed b. light may be transmitted through or c. reflected remitted from surface
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2. photosyntehetic pigments a. capture/absorb light for photosynthesis b. embedded in thylakoid membranes c. chlorophyll i. porphyrin ring 1. absorbs light Energy 2. Carbon and Nitrogen 3. Magnesium atom in center 4. Alternating single and double bonds which allow it to absorb light
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lecture 9 (10-11) - Lecture 9 Plant Photosynthesis CO2...

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