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3.1 Proteins, catalysts and enzymes

Proteins are made of long chains of amino acids

Proteins have many different functions.

Some proteins are enzymes which act as biological catalysts.

1. Proteins are made up of long chains of amino acids.

3.2 Factors affecting enzyme action

Factors which alter the shape of the active site prevent the enzyme from working.

Enzyme activity is affected by temperature and pH

1. When the temperature gets too hot and the enzyme stops working because the active site changes shape.

3.3 Enzymes in digestion

Digestive enzymes are made by glands in the digestive system.

Digestive enzymes work outside the body cells int he cavity of the digestive system.

Specific enzymes digest each particular food type.

1. Amylase.

3.4 Speeding up digestion

Enzymes work best in a narrow pH


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