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OUTLINE 4a - OUTLINE 4A Chapter 10 cont The Light Reactions...

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OUTLINE 4A Chapter 10 cont. The Light Reactions: An Introduction - 10.3.1 >Photosystems are the light-harvesting complexes of the thylakoid membranes. Chlorophyll a and the accessory pigments are arranged into a photosystem (see fig. 10.12) -satellite dish with receiver in the middle of the dish Photosystems are composed of a few hundred pigment molecules Components of a photosystem: 1. Antenna complex 2. Reaction-center chlorophyll 3. Primary electron acceptor There are two types of photosystems 1. Photosystem I (PS-I) 2. Photosystem II (PS-II) Photosystem 1 - 10.3.2 Photosystem I => P700 Reaction center has a specialized chlorophyll that absorbs light best at 700 nm. Photosystem 2 - 10.3.3 Photosystem II => P680 Reaction center has a specialized chlorophyll that absorbs light best at 680 nm >>>>>The light reactions transform light energy to chemical energy (see fig 10.5) --- Light reaction - the reaction of photosynthesis that converts light energy to chemical bond energy in ATOP and NADPH -Solar energy to chemical energy -Occurs in the thylakoid membranes -Reduces NADP + to NADPH -H 2 O split, O 2 byproduct -Generates ATP by photophosphorylation
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NOTE: no sugar produced --- photophosphorylation the production of ATP that is coupled to the transfer of electrons energized by light The Light Reactions: A Summary - 10.3.4 >Noncyclic electron flow (see fig. 10.13) The electrons that are excited from each of the photosystems can be donated to a primary electron acceptor.
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