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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