Food tests +questions

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Notes gained from college, OCR Heineman biology textbook and revision guide, CGP OCR biology revision book and other resources found in the college library.

The questions have either been made up or from the resources.

Good luck in your exam!

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In answering recall questions about the biochemical tests for biological molecules, you must:

State that heat to 80 degrees Celsius is needed to be applied in Benedict's tests.
State the colour change you would see in a positive result for any of the tests.


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Lipids will dissolve in ethanol but not water.
Add lipids and shake with ethanol.
Add shaken ethanol to water.
If the solution goes cloudy, lipids are present.
Quantity measured with a colorimeter.

Add biuret reagent.
This turns the solution from blue to purple if there is protein present.


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