2.7 Test Starch and Glucose

Test For Glucose - C6H12O6

1. put the glucose powder in the test tube with water and dissolve it.
2. add the Benedict's reagent 'blue'. Test tube would become blue colour.
3. place the test tube in he water bath (60-70c) and put it for 2/3 mins.
4. take the test tube out and the result you get is orange colour and it will soon become green.

Test For Starch

1. white powder into the spotting tiles and add iodine solution (brown colour).
2. the change is from brown colour to very dark blue back colour. ( positive test).

2.6 Biological Molecules

• Carbohydrates - sugars and large molecules that sugar combine to is starch (plants) and glycogen (animals).
• Proteins - amino acids , amino acids join together to form actual proteins.
• Lipids - has 2 groups-glycerol and atty acids and they both join together to form lipids.

2.5 Elements in biological molecules

• Carbohydrates- CHO are present.
• Protein - CHON are present.
• Lipid-CHO are present.
• Lipid and Carbohydrates has the same structure 'CHO'
• Carbohydrates includes sugar and large molecules is ploysacchrides (starch). Proteins are amino acids which includes nitrogen. Lipids has 2 groups first one is fats from the animals and the other group is oils from the plants.