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Chapter 10 PHOTOSYNTHESIS

Chapter 10 PHOTOSYNTHESIS - From sunlight to Snickers...

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From sunlight to Snickers
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Summary Overview of photosynthesis What is light? Chloroplasts Pigments Capturing light energy Light dependent reactions Light independent reactions Photorespiration C4 pathway
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Why is Photosynthesis  Important? Autotrophs vs. heterotrophs What do autotrophs provide heterotrophs with? What do heterotrophs provide autotrophs with?
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Photosynthesis Overall reaction: 6CO 2 + 12 H 2 O + light energy → C H O + 6O + 6H 2 O
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Photosynthesis 2 sets of reactions, fig 10.1 Photo = light dependent reactions ; capturing light energy and transforming it into ATP and “reducing power” (NADPH). Synthesis = light independent reactions ; using ATP and NADPH to reduce CO 2 and produce sugars.
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Photosynthesis What is light? Electromagnetic energy – many different energy levels = spectrum. Visible light is a small part of the electromagnetic spectrum, fig 10.4. Visible light appears white but contains many different wavelengths (energy levels) of light that we interpret as different colors.
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Photosynthesis What is light? If an object absorbs all of the wavelengths (or colors) of light it appears black, if it reflects all of the colors it appears white. If an object appears green, what color is its reflecting? Absorbing? If an object appears orange, what color is it reflecting? Absorbing?
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Photosynthesis Chloroplasts – a review, fig 10.2. Double membrane Inside Stroma – gel-like matrix Grana – stacks of sacks Thylakoids – sacks with light absorbing pigments in the membranes.
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Photosynthesis Pigments in chloroplasts Chlorophyll a and b ; absorb blue and red light, reflect greens Carotinoids : β carotene, xanthophylls, etc.; absorb blue and green light, reflect yellow/orange/red.
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