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==Key Stage 3==
===Meaning===
The '''lock and key model''' is a way of [[model]] used to explainwhy [[enzyme]]s only work on certain [[Substrate (Biology)|substrate]]s. ===About The Lock and Key Model===: The '''lock and key model''' proposes that an [[enzyme]ing ] 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 (Biology)|substrate]] can fit an [[enzyme]].{| class="wikitable"|-|[[File:DenaturedEnzyme.png|center|400px]]|-| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows an [[enzyme]] (the lock) and the [[substrate (Biology)|substrate]] (the key) fitting together. If the lock is '[[denaturation|denatured]]' the key no longer fits the lock and so the [[enzyme]] does not work.|} ==Key Stage 4=====Meaning===The '''lock and key model''' is a [[model]] used to explain why [[enzyme]]s only work on certain [[Substrate (Biology)|substrate]]s.
===About The Lock and Key Model===
: 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 (Biology)|substrate]] can fit into the [[Active Site|active site]] of an [[enzyme]].
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