BIOL 101 Lecture Notes - Lecture 11: P700, Purple Sulfur Bacteria, Heterotroph
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Heterotrophs obtain their organic material from other organisms: heterotrophs are the consumers of the biosphere, almost all heterotrophs, including humans, depend on photoautotrophs for food and o2. Photosystem ii (ps ii) functions first (the numbers reflect order of discovery) and is best at absorbing a wavelength of 680 nm: the reaction-center chlorophyll a of ps ii is called p680. Photosystem i (ps i) is best at absorbing a wavelength of 700 nm: the reaction-center chlorophyll a of ps i is called p700, during the light reactions, there are two possible routes for electron flow: cyclic and linear. Linear electron flow, the primary pathway, involves both photosystems and produces atp and nadph using light energy. A photon hits a pigment and its energy is passed among pigment molecules until it excites p680. An excited electron from p680 is transferred to the primary e- acceptor. P680+ (p680 that is missing an electron) is a very strong oxidizing agent.
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