This reaction is catalyzed by the enzyme carbonic anhydrase (CA) which is found in RBC’s. Since this reaction takes place in the absence of the enzyme what is the physiological advantage in having such enzyme in the blood? PROBLEM WITH CO2- is that is not very soluable in H2O (blood can't dissolve enough CO2 to carry away from tissues) 3.

Abstract. : co2 + h2o → h2co3 → h+ + hco3- Average time for beaker A to change is 59 seconds, and for beaker B to change is 2 seconds, that is, the reaction occurred faster in solution B. [Hint: find what the turnover number is for this enzyme] This enzyme is also found in chloroplasts. The rate of catalysis, among the fastest known, is pH-dependent, with a pK Enz near neutral. CO2 + H2O → H2CO3 (reactants) (product -carbonic acid) 1. cells and tissues produce CO2 which travels to the lungs via bloodstream, and is then exhaled 2. Carbonic anhydrase (carbonate dehydratase) catalyzes the following reaction: CO2 + H2O -----> H2CO3 The enzyme is widespread in nature. On the venous side of systemic capillaries CO2 enters red blood cells (RBC) where it combines with water to form carbonic acid (H2CO3). Carbonic anhydrase, a metalloenzyme containing one zinc atom per protein molecule of molecular weight 30,000, catalyzes the interconversion of CO 2 and HCO 3-in solution.

In plants, carbonic anhydrases are involved in … For this to occur, an enzyme such as carbonic anhydrase must have been present in beaker B. What is the enzyme that catalyzes the reaction CO2 + H2O - H2CO3 in human tissues, including blood? Bicarbonate represents the largest fraction of the CO2 in blood (~88%). In animals it plays an important role in respiration by facilitating the transport of carbon dioxide.

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