Answer:
The lock and key model for enzyme-substrate interaction suggests that the enzyme and the substrate have specific complementary shapes that fit exactly into one another. The substrate is the key, the enzyme the lock and the active site the key hole.
Step-by-step explanation:
The lock and key model is an explanation of how an enzyme-substrate complex works and how enzymes are specific for certain substrates. The lock and key model suggests that every enzyme has a specific active site which is a perfect fit for a specific substrate. When the substrate fits into the active site, the process of catalysis starts to occur. The shape of the active site is a perfect fit for a specific kind of substrate only which makes the process effective.