Biology - Diet and Digestion

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  • Created by: Smartieee
  • Created on: 20-12-12 19:02

Tests for glucose and starch:

Glucose: Blue Benedict’s solution turns orange-red when heated with glucose.

Starch: Liquid Iodine turns from reddish-brown to blue-black if starch is present.

Enzymes are biological catalysts that control the reactions in a cell. A catalyst speed up a reaction without being used up or changing the reaction. Enzymes are proteins. The shape of the protein molecule makes an active site. The substrate attaches to this active site. The reaction takes place and products are formed. Anything that changes the shape of the active site stops the enzyme working. This is called denaturing and can be caused by a change in temperature and pH.

You can investigate the effect of temperature on the enzyme amylase using starch and iodine, putting the mixture in water baths at different temperatures.


Carbohydrates are sugars and starches. They are made up of atoms of carbon, hydrogen and oxygen joined together. They provide energy for the cells. Simple carbohydrates like glucose and sucrose are sugars. Complex carbohydrates like starch, glycogen and cellulose are long chains of sugars such as glucose or fructose joined together.


Proteins are long chains of amino acids. Proteins are used for body building. They contain carbon, hydrogen and oxygen but they have nitrogen and sulphur atoms as


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