BI-1313
Food tests
Biology · Secondary 4 · Medium · Food tests
A student wants to test a food sample for the presence of protein. She grinds the food with water and filters it. Which set of reagents and result would correctly show that protein is present in the filtrate?
- Add Benedict’s solution and heat; a brick-red precipitate forms.
- Add iodine solution; a blue-black colour appears.
- Add sodium hydroxide followed by copper(II) sulfate; a violet colour appears.
- Add ethanol then water; a cloudy white emulsion appears.
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