Question

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

Answer 1

The correct option is B interacts with a specific type of substrate molecule

Emil Fischer (1894) proposed “lock and key theory” for the mechanism of enzyme action, according to which the active sites of enzymes have a specific geometric shape wherein the substrate molecule fit 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.