BB lecture 10--29-08 photosynthesis I

BB lecture 10--29-08 photosynthesis I - Chapter 10 (pp....

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Chapter 10 (pp. 185-204) Photosynthesis – Part 1 Learning objectives: • Write the summary equation for photosynthesis • Know the significance of photosynthesis in the carbon cycle • Draw the chloroplast structure and indicate where chlorophyll is located • Explain the function of accessory pigments • Be able to diagram the photosynthetic light reaction pathways • List the inputs and outputs of photosystems I and II • Differentiate between cyclic and noncyclic electron flow
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light
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UV Fig. 10-6 The electromagnetic spectrum Visible light Infrared Micro- waves Radio waves X-rays Gamma rays 10 3 m 1 m (10 9 nm) 106 nm 103 nm 1 nm 10–3 nm 10–5 nm 380 450 500 550 600 650 700 750 nm Longer wavelength Lower energy Higher energy Shorter wavelength
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Figure 10.11 Excitation of isolated chlorophyll by light Excited state Energy of election e Heat Photon (fluorescence) Chlorophyll molecule Ground state Photon (a) Excitation of isolated chlorophyll molecule (b) Fluorescence
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Figure 10.7 Why leaves are green: interaction of light with chloroplasts Light Reflected Light Chloroplast Absorbed light Granum Transmitted light The thylakoid is the structural unit of photosynthesis.
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Pigments of photosynthesis Chlorophylls absorb red and blue light Absorbs major wavelengths used in photosynthesis Carotenes/carotenoids absorb blue-green and blue light Absorbs additional wavelengths and transfers that energy to chlorophyll for use in photosynthesis Anthocyanins absorb blue, blue-green,
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BB lecture 10--29-08 photosynthesis I - Chapter 10 (pp....

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