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3 Cards in this Set
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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 |
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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 |
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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. |
