BIOL 1102 Lecture Notes - Lecture 5: Anabolism, Catabolism, Passive Transport

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Energy: the capacity to do work: 1st law of thermodynamics: energy can be changed from one form to another, but it cannot be destroyed. It gives up its third phosphate group to become adp. Electrons are transferred from one molecule to another. A molecule is oxidized if it gives up electrons and reduced if it gains electrons: electron transport chains: molecules that accept and give up electrons in sequence. Electrons can give up energy at each step in the chain: metabolic pathways: an enzyme-controlled sequence of chemical reactions. Ex: the assembly of glucose, starch, and glycogen. Ex: breaking down glucose or fats to release their energy. Lower activation energy needed to start a chemical reaction: enzymes are important biological molecules because. Help the enzyme function properly (are sometimes destroyed by the reaction and must be remade. Co-enzymes move electrons and hydrogen ions from one reaction to another)

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