BIOLOGY 1113 Lecture Notes - Lecture 18: Electron Transport Chain, Reduction Potential, Electrochemical Gradient

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9. 5: electron transport and chemiosmosis: building a proton gradient to produce atp. Electron transport chain- membrane bound complex/mobile electron carriers(nadh/fadh from redox reaction actively transports protons across membrane(mitochondria) w/ each other(consists of cofactors/prosthetic groups- easily reduced/oxidized). ) involved in series of redox reactions, release of energy. Ubiquinone/coenzyme q- molecule in inner membrane of mitochondria, lipid soluble molecule(transfers electrons), moving through hydrophobic interior of mitochondria membrane. Redox potential- ability to accept electrons in redox reaction(electrons pass from lower redox potential to ones with higher redox potential, leading to less potential energy in each bond(tighter bonds)). Cytochrome c(cyt c)- soluble protein,intermembrane space of mitochondria, shuttles electrons between membrane bound complexes in. Etc takes place in inner membrane of mitochondria. In complex one, nadh is oxidized, and energy is released, so protons are being pumped out to intermembrane space. In complex 2, fadh2 is oxidized, electrons latch onto q, where they head.

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