BIOL 1000 Lecture Notes - Lecture 20: Electron Transport Chain, Electrochemical Gradient, Chemiosmosis

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Metabolic pathways: an overview of cellular respiration and fermentation. Sunlight + co2 +water oxygen + sugar. Net atp produced in cellular respiration is 38 atp. Formula for cr: c6h12o6 + 6o2 6co2 + 6h2o + atp + heat. Cr is a series of reactions that converts glucose into atp. Nad+ and fad are the electron carrier in cellular respiration: nad+ + 2e- + 2h+ nadh + h, fad + 2e- + 2h+ fadh2. Atp, nadh and fadh2 are activated carrier molecules: glycolysis: split sugar into two 3 carbon molecules. Net generation of atp: pyruvate oxidation, citric acid cycle/kreb"s cycle: Generate a bit of atp and lots of electron carriers: electron transport chain, chemiosmosis: bulk atp generation. Harnessing the energy present in the proton gradient to drive chemical reactions (atp formation: proton motive force: potential energy due to concentration gradient (ph) of protons and the charge gradient (voltage) across the membrane.

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