Ncert Exercises & Solutions

27. Formation of Enzyme substrate complex (ES) is the first step in the catalysed reactions. Describe the other steps till the formation of product.

Each enzyme molecule has an active site for specific binding of substrate molecules . The enzyme work by altering the activation energy of the reaction.

The catalytic site of an enzyme can be described asfollows

(i) The substrate process to the active site of the enzyme, fitting into it.

(ii) Binding of the substrate induces the enzymes to alter its shape teading to formation of the Enzyme Substrate (ES) complex.

(iii) The active site of the enzyme, now is in close proximity with the substrate and break its chemical bonds and a new enzyme product complex is formed.

(iv) The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of substrate and run through the catalytic cycle once again.

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