Carbonic anhydrase catalysis Even a reaction as simple as the hydration of carbon dioxide is catalyzed by an enzyme namely,carbonic anhydrase(脱水酶). Carbonic anhydrase CO2+H2O H.CO; substrates Products The transfer of CO,from the tissues (组织)into the blood(t血液)and then to the alveolar(肺泡的)air would be less complete in the absence of this enzyme.This catalyzed reaction is 107 times as fast as the uncatalyzed one
Carbonic anhydrase catalysis Even a reaction as simple as the hydration of carbon dioxide is catalyzed by an enzyme namely, carbonic anhydrase (脱水酶). The transfer of CO2 from the tissues （组织） into the blood （血液） and then to the alveolar (肺泡的) air would be less complete in the absence of this enzyme. This catalyzed reaction is 107 times as fast as the uncatalyzed one. substrates Products
Enzymes are highly specific in reactions Enzymes are highly specific both in the reactions that they catalyze and in their choice of reactants,which are called substrates底物. A+B→C+D Substrates Products An enzyme usually catalyzes a single chemical reaction or a set of closely related reactions. Side reactions副反应leading to the wasteful formation ofby-products副产物are rare in enzyme-catalyzed reactions,in contrast with uncatalyzed ones. A+B→C+D+D Substrates Products by-products
Enzymes are highly specific in reactions Enzymes are highly specific both in the reactions that they catalyze and in their choice of reactants, which are called substrates 底物. A + B C + D Substrates Products An enzyme usually catalyzes a single chemical reaction or a set of closely related reactions. Side reactions 副反应 leading to the wasteful formation of by-products 副产物 are rare in enzyme-catalyzed reactions, in contrast with uncatalyzed ones. A + B C + D + D’ Substrates Products by-products