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Solution


Q.

The ‘lock’ and ‘key’ model of enzyme action illustrates that a particular enzyme molecule
 a) May be destroyed and resynthesised several times
 b) Interacts with a specific type of substrate molecule
 c) Reacts at identical rates under all conditions
 d) Forms a permanent enzyme-substrate complex

Ans.

(b) Emil Fisher (1894) proposed ‘lock and key theory’ for the mechanism of enzyme action, according to which the active sites of enzyme have a specific geometric shape wherein the substrate molecules fit in just like a key in a particular lock. In other words, it illustrates that a particular enzyme molecule interacts with a specific type of substrate molecule.