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Give the special characteristics of enzyme catalysed reactions. |
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Answer» Solution :(i) Effective and efficient conversion is the special characteristic of enzyme catalysed reactions. An enzyme may transform a million molecules of reactant in a MINUTE. For eg. `2H_2O_2 to 2H_2O + O_2` For this reaction, the ACTIVATION energy is18k cal/mole without a catalyst. With colloidal platinum as a catalyst the activation energy is 11.7kcal /mole But with the enzyme catalyst the activation energy of this reaction is less than 2kcal/ mole. (ii) Enzyme catalysis is highly specific in nature. (iii) Enzyme catalysed reaction has maximum rate at optimum temperature. The rate of enzyme catalysed reactions varies with the pH of the system. The rate is maximum at a pH called optimum pH. Enzymes can be INHIBITED i.e. POISONED. Activity of an enzyme is decreased and destroyed by a poison. The physiological action of DRUGS is related to their inhibiting action. (vi) Catalytic activity of enzymes is increased by coenzymes or activators. |
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