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Chemical Reactions and Metabolism

Chemical Reactions and Metabolism. Metabolism= Anabolism + Catabolsim. Metabolism is the sum total of the c ellular processes occurring in living t hings Such chemical reactions use enzymes a nd the molecules involved in these r eactions are called metabolites Anabolic reactions

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Chemical Reactions and Metabolism

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  1. Chemical Reactions and Metabolism

  2. Metabolism= Anabolism + Catabolsim • Metabolism is the sum total of the cellular processes occurring in living things • Such chemical reactions use enzymes and the molecules involved in these reactions are called metabolites • Anabolic reactions •endergonic •produce +∆G (change in free energy) and is used to do work •large molecules are made from these types of reactions •examples: synthesis of carbs of ca

  3. Metabolism= Anabolism + Catabolsim • Catabolic reactions •exergonic •produce -∆G (change in free energy) and is released light or heat energy •large molecules are broken down in these types of reactions •examples: digestion of complex food & cell respiration

  4. General information • ΔG is the change in free energy. • Reactions prefer a lower energy state, thus a negative ΔG change is favored • Negative ΔG indicates that the reaction is exergonic and spontaneous • Positive ΔG indicates that the reaction is endergonic, or that it requires energy to go from reactants to products. • Endergonic & exergonic reactions are usually coupled together, linking energy producing reactions with energy requiring reactions

  5. Graphs: EndergonicvsExergonic

  6. Metabolism and Enzymes • Activation energy is the minimum energy needed raise substrates to a transition state so reactions can occur and new products form • Enzymes lower the activation energy by breaking or weakening substrate bonds • Enzymes help reduce the activation energyrequired for metabolic reactions • Graph displays activation energy needed

  7. Metabolism and Enzymes: Comparison of Reactions with and without Enzymes Article Summarizing ATP, Energy and Enzymes

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