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
Explanation
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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.