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biological catalyst
An enzyme is a(n) ________- this means they speed up a reaction without being used up themselves.
Enzymes
________ are proteins and so, are made up of long chains of amino acids.
active site
When it binds to the ________, the substrate fits into the enzyme to form an enzyme- substrate complex.
catalyst
A(n) ________ is a substance that speeds up the rate of reaction but remains unchanged at the end of the reaction.
Catalase
________ and pepsin are types of enzymes.
Hydrogen peroxide
________ is a harmful chemical found in all cells.
chemical reaction
The molecules involved in a(n) ________ in a cell are- Substrate- The substance that an enzyme acts on.
Egg white suspension
________ is cloudy because it has large protein molecules in it.
Enzyme activity
________ is affected by temperature and ph.
temperature
Changes in ________ and pH can cause changes in the shape of an enzymes active site.
Properties of enzymes
________- speed up chemical reactions, not changed by reaction.
breakdown of hydrogen peroxide
An enzyme called catalase speeds up the ________ into oxygen and water.
enzyme
The ________ is like a lock, and the substrate is like a key.
Enzymes
________ work around ph7 anything above and below optimum change the ________ shape meaning it has denatured.
Enzymes
________ are made of protein.
Enzyme
________- The catalyst that speeds up the reaction.
Enzymes
________ are involved in many reactions in living things and your body.
Enzymes
________ are active over a narrow range of pH values.
An enzyme is a biological catalyst
this means they speed up a reaction without being used up themselves
Properties of enzymes
speed up chemical reactions, not changed by reaction
Break down large molecules into smaller ones e.g., digestion
breakdown of food molecules
Enzyme
The catalyst that speeds up the reaction
Product
The substance(s) produced
Practical 1
Catalase activity in different tissues
Practical 1
Method
Practical 2
Specificity of enzymes
Practical 2
Method
Tube A
2 cm3 hydrogen peroxide solution and 1 cm3 of catalase and 2 drops of detergent
Tube B
2 cm3 hydrogen peroxide solution and 1 cm3 of pepsin and 2 drops of 1 mol hydrochloric acid
Tube C
2 cm3 egg white suspension and 1 cm3 of catalase and 2 drops of detergent
Tube D
2 cm3 egg white suspension and 1 cm3 of pepsin and 2 drops of 1 mol hydrochloric acid
If the shape of the active site changes too much the enzyme will be denatured
it will be inactive
Practical 3
Enzymes and temperature
Note 
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