BIOL 102 Chapter 9: BIOL 102 Chapter 9

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29 Nov 2015
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Cellular respiration & fermentation - life is work, and that work needs. Overview of metabolism: metabolic pathways as controlled chemistry. Must be coupled to exergonic reaction: each step coordinated by a specific enzyme exergonic, catabolic pathways: breakdown, anabolic pathways: synthesis,endergonic. Catabolic reactions: breakdown of reactants (e. g. starch, glycogen, used for recycling, used to obtain energy for endergonic reactions. Atp, nadh: 2 ways to make atp, substrate-level phosphorylation, chemiosmosis. Energy intermediates: electrons removed by oxidation are used to create energy intermediates like nadh, nad+ Oxidation of organic fuel molecules during cellular respiration. During cellular respiration, the fuel (such as glucose) is oxidized, and o2 is reduced. Electron transport chain: unlike an uncontrolled reaction, the electron transport chain passes electrons in a series of steps. Anabolic reactions: biosynthetic reactions, make large macromolecules, tissues, organs, etc or smaller molecules not available from food, powered by catabolism. ** each atp undergoes 10,000 cycles of hydrolysis and resynthesis every day.

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