Carbohydrates, proteins and lipids with food tests, and enzymes and the factors affecting them.
Biological molecules
Carbohydrates — from simple sugars; energy.
Proteins — from amino acids; growth/repair and enzymes.
Lipids — glycerol and fatty acids; energy store and insulation.
| Test | Reagent | Positive result |
|---|---|---|
| Starch | iodine | blue-black |
| Reducing sugar | Benedict's + heat | brick-red |
| Protein | biuret | purple |
| Lipid | ethanol emulsion | cloudy white |
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