Outline 10&11.doc - GeneralFeatures o Endergonic: o...

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Principles of Metabolism General Features Two broad classes of metabolic reactions: o Endergonic: energyically unfavorable  o Exergonic: energetically favorable ATP (Adenosine Triphosphate;  Fig 13-9 ) (Slide 1) – Major energy carrier of  cells; GTP also used in some reactions o Can use other related sources  o Constituent of RNA  Same energy source Some electron carriers can also act as energy carriers ( Fig 13-10 ) (Slide 2): o NAD^+ - Nicotinamide Adenine o Dinuclucleotide o FAD – Flavin Adenine Dinucleotide Many biosynthetic reactions are endergonic, thus require energy input (Slide 3) o Energy derived from exergonic reactions o Pricess known as METABOLIC COUPLING  Redox (Reduction-Oxidation) Reactions  Energy transfer occurs during redox reactions Electron donor: reducing agent or reductant Electron acceptor: oxidizing agent or oxidant The Redox Couple (Slide 4) Oxidant + e   Reductant Oxidants o When oxidant accepts an electron, it beomes a reductant Reductants o
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