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Catalyst
A catalyst is a substance which increases the speed of a reaction, without being changed or used up in the reaction.
-Enzymes are all proteins and all proteins are made up of chains of amino acids. These chains are folded into unique shapes, which enzymes do their jobs
Enzymes have special shapes so they can catalyse reactions
-chemical reactions usually involve things either being split apart or joined together
-every enzyme has a unique shape that fits onto the substance involved in a reaction
-enzymes usually catalyse one reaction
-this is because for the enzyme to work, the substance has to fit its special shape. If it doesn't match the enzymes shape then the reaction wont be catalysed
Digestive enzymes break down big molecules into smaller ones
-starch, proteins and fats are big molecules. They're too big to pass through the walls of the digestive system
-sugars, amino acids, glycerol and fatty acids are much smaller molecules. They can pass easily through the walls of the digestive system.
-the digestive enzymes break down the big molecules into the smaller ones.
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