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| Biological Molecules. These molecules are things like Carbohydrates, Proteins, and Lipids. They are usually, long complex chains of molecules, made up of smaller basic units. | |
| Carbohydrates. Contain the element, Carbon, Hydrogen and oxygen. Starch and glycogen are large, complex carbohydrates. Made of smaller units like glucose or maltose in long chains. |
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| Proteins. Contain the atoms Carbon, Hydrogen, Oxygen and Nitrogen. Proteins are made up of long chains of amino acids. |
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| Lipids. Contain the elements, Carbon, Hydrogen and Oxygen. Lipids (fats and oils) are made up of fatty acids and glycerol. |
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lipid (image/jpg)
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| Test for Glucose. Benedict's Reagent: if a sample is added and then heated but not boiled. A positive test for glucose will turn a coloured precipitate from blue to red, dependant on the concentration of glucose. | Test for Starch. Placing a sample in an iodine solution , if starch is present the iodine solution will change from browny-orange to a blue-black, dependant on the concentration of starch. |
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