BIO1022 Study Guide - Final Guide: Cellular Respiration, Activation Energy, Catalase
Document Summary
Sum of all chemical reactions in an organism. Involves regulation of heat, water, salts, glucose, ph, etc: fecal loss. Chemical energy is obsorbed: loss in urine, secretions, skin, hair. Metabolisable energy: used in production of new tissue, digestion and synthesis of molecules, activity, basal (standard) metabolism- at resting state. Catalyse otherwise stable or slow reactions by lowering the activation energy required for a particular reaction to occur. Heat also catalyses these reactions, but would kill to cell. Most common enzyme is catalase: found in nearly all living organisms that are exposed to oxygen, decomposes hydrogen peroxide to water and oxygen, h2o2 is a harmful byproduct of aerobic metabolism. Substrates attach to active site with weak interactions. Activation energy of reaction is reduced, reaction speed is increased. Reaction occurs and reactants are converted to products. Products are released from the enzyme, which reverts to its original shape. Transferases: transfer functional group from donor to acceptor molecule.
