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==Key Stage 3==
===Meaning===
[[File:DigestiveEnzyme.png|right|300px|thumb|The '''digestive enzyme''' shown in purple attaches to the [[Substrate (Biology)|substrate]] which is broken down into two smaller pieces.]]
A '''digestive enzyme''' is a [[molecule]] made in the [[Digestive System|digestive system]] that breaks down large food [[molecule]]s into smaller [[molecule]]s.
: '''Digestive enzymes''', like all [[enzyme]]s, are made of [[protein]]s.
: '''Digestive enzymes''' work as a [[catalyst]] for the breakdown of large [[molecule]]s.
: '''Digestive enzymes''' are shaped to work on only one [[Substrate (Biology)|substrate]]. This called the [[Lock and Key Hypothesis]].
Some '''digestive enzymes''' you should know:
*[[Carbohydrase]]s - [[Salivary Amylase]], [[Pancreatic Amylase]] and [[Amylase]].
*[[Protease]]s - [[Pepsin]], [[Trypsin]] and [[Petidase]]
*[[Lipase]]