Class 12 Chemistry Surface Chemistry Characteristics of Enzyme catalysis

Characteristics of Enzyme catalysis

Highly Efficient

  • One molecule of an enzyme may transform one million reactant molecules per minute


Highly Specific in Nature

  • Catalysts are highly specific

Example- Urease enzyme catalyses the hydrolysis of urea only and not the hydrolysis of any other amide


Highly active at Optimum temperature

  • The temperature at which the rate of an enzyme catalysed reaction is maximum is called Optimum temperature. On either side this temperature, enzyme activity decreases

Example- Human body temperature(310K) is suitable for enzyme-catalysed reactions


Highly active at Optimum pH

  • The rate of an enzyme-catalysed reaction is maximumat a particular pH called the Optimum pH


Activity Increases in presence of Activators and Co-enzymes-

  • The enzymatic activity increases considerably in the presence of certain other substances called co-enzymes.

Example- When a certain non-protein(vitamin) is present along with the enzyme, catalytic activity is enhanced


Influence of inhibitors and Poisons-

  • Like ordinary catalysts, enzymes are also inhibited by the presence of certain substances (inhibitors or poisons).
  • These substances interact with the active functional groups on the surface of the enzyme and usually reduce or completely destroy the catalytic activity of the enzymes

Example- Many of the drugs we use is related to their action as enzyme inhibitors in our body

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