Changes

The '''lock and key model''' is a way of [[explain]]ing why [[enzyme]]s only work on certain [[Substrate (Biology)|substrate]]s.

: The '''lock and key model''' proposes that an [[enzyme]] is a like lock and a [[Substrate (Biology)|substrate]] is like a key as only one key can fit a lock, just as only one [[substrate]] can fit into the [[Active Side|active site]] of an [[enzyme]].