BI-1256
Food tests
Biology · Secondary 4 · Easy · Food tests
A student wants to test a food sample for protein. Which correct sequence of steps should she follow?
- Add sodium hydroxide, then copper(II) sulfate; violet colour indicates protein
- Add Benedict’s solution and heat; green colour indicates protein
- Add ethanol, then water; cloudy white layer indicates protein
- Add iodine solution; blue-black colour indicates protein
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