Question

The 'lock and key' model of enzyme action illustrates that a particular enzyme molecule

• A. Forms a permanent enzyme-substrate complex
• B. Reacts at identical rates under all conditions
• C. Interacts with a specific type of substrate molecule
• D. May be destroyed and resynthesised several times

Answer 1

The correct option is C

Interacts with a specific type of substrate molecule

Enzymes have specific regions on their molecule called active sites. These regions are in the form of grooves or pockets.

The structure of these pockets is highly specific for their substrates. The enzyme and substrate fit like a lock and key and thus is a lock and key model of enzyme action.