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Unformatted text preview: Photosynthesis: I. Introduction: a. Photosynthesis (PS) is the ability to make food in presence of light. i. Energy of sunlight is used to fix CO 2 into organic compounds by way of reduction. ii. Oxidation/Reductionnote that its usually an H atom and not JUST an electron that moves. b. Who does it? Autotrophs or more specifically, photoautotrophs. c. Reaction: i. 6CO 2 + 12H 2 O + Light -> C 6 H 12 O 6 + 6H 2 O + 6O 2 d. ~250 billion metric tons of sugar produced through photosynthesis per year i. Estimated that just over half of this occurs in the ocean e. Overall procedure: i. Suns energy has to be captured ii. Plant makes ATP and NADPH iii. Plant uses ATP and NADPH to make sugar I I. Where does it happen: a. Anywhere green: i. Leaves, Stems, underneath flowers, green fruits ii. Leaves: 1. Specifically adapted for photosynthesis a. See notebook for diagram b. Fig. 8.1 b. Chloroplasts: i. Contain thylakoids which form into stacks known as grana (singular: granum) 1. Thylakoid structure: a. Particles exist on/in membrane of the thylakoids containing pigments. These systems of particles are called photosystems. i. Sun energy is randomly passed from particle to particle until it lands on reaction center molecule which takes that energy and sends it somewhere else ii. Read section 8.2 in book: 1. C.B. Van Niel: a. Worked on purple sulfur bacteria b. Realized that these bacteria could photosynthetically make sugar units with Carbon Dioxide and H 2 S instead of Water. c. Realized that the Sulfur molecule split and released in an elemental form d. Realized that with plants, oxygen is split instead of sulfur, and he ended up discovering the general form for the photosynthesis reaction....
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