chapter7-2

chapter7-2 - Chapter 7. Capturing Solar Energy:...

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Chapter 7. Capturing Solar Energy: Photosynthesis
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Chloroplasts are the site for photosynthesis in plants Photosynthesis transforms light energy trapped by chloroplasts into chemical bond energy and stores that energy in sugar and other organic molecules Synthesis of energy-rich organic molecules (glucose) from energy-poor molecules (CO2 and H2O
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Uses CO 2 as a carbon source and light-energy as the energy source. Directly or indirectly supplies energy to most living organisms
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cellular respiration photosynthesis ( chloroplast ) H 2 O CO 2 sugar ATP O 2 (mitochondrion) Leaves are the major organs of photosynthesis
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cuticle Internal leaf structure upper epidermis mesophyll cells lower epidermis chloroplasts bundle sheath vascular bundle (vein) stoma outer membrane inner membrane thylakoid stroma granum (stack of thylakoids) channel interconnecting thylakoids Chloroplast in mesophyll cell Leaves
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Leaves are the major organs of photosynthesis Chlorophyll is the green pigment that gives a leaf its color. Chlorophyll is also responsible for the absorption of the light energy that drives photosynthesis
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mesophyll cells Chloroplasts are primarily in cells of mesophyll (in the leaf interior)
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thylakoid stroma Chloroplasts contain the thylakoids and the stroma
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thylakoid stroma Thylakoids are flattened membranous sacs inside the chloroplast. Chlorophyll is located in the thylakoid membrane. Stroma is a semi-fluid medium
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thylakoid stroma The thylakoids are arranged in stacks called grana . The thylakoids are where the light-dependent reactions occur. granum (stack of thylakoids
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LIGHT-DEPENDENT REACTIONS (thylakoids) LIGHT-INDEPENDENT REACTIONS (stroma) depleted carriers (ADP, NADP + ) H 2 O O 2 CO 2 + H 2 O glucose energized carriers (ATP, NADPH)
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--- Light reaction is the reaction of photosynthesis that converts light energy to chemical bond energy in ATP and NADPH -Solar energy is conveted to chemical energy -Occurs in the thylakoid membranes - converts NADP + to NADPH -H 2 O is split, releasing O 2 as by product Light-dependent reaction
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In the light-dependent reaction: H 2 O + NADP + + ADP = > O 2 + NADPH + ATP 2H 2 O 4H + + 4e - + O 2 NADPH - is a high energy electron carrier (Nicotinamide adenine dinucleotide phosphate)
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thylakoids and inside the inner chloroplast membrane. The stroma is the site of the
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This note was uploaded on 02/21/2010 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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chapter7-2 - Chapter 7. Capturing Solar Energy:...

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