DUMET Medical DUMET Medical Solved Paper-2009

  • question_answer
    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 q specific type of substrate molecule

    C)  reacts at identical rates under all conditions

    D)  forms a permanent enzyme-substrate complex

    Correct Answer: B

    Solution :

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


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