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Enzymes are catalysts because they speed up chemical reactions
Most of these reactions, such as:
- photosynthesis
- respiration
- protein synthesis
Take place inside living cells.
Enzymes can be used to catalyse the same type of reaction many times.
The shape of an enzyme is vital for its function
Enzymes, like proteins, are folded into a particular shape. The shape of one particular area of the enzyme molecule, called the active site, is very important
- The substrate molecules fit into the active site
- This brings them together so they can form a bond
- This makes a bigger molecule
Enzymes active site
The two substrate molecules fit side by side into the enzyme's active site, a bond forms between them, and one large product molecule is formed.
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