Biology for IGCSE & O level - Biological Molecules (Section 2 - No. 35)
Which of the following best describes the chemical test for proteins?
Iodine solution used and a color change to blue-black.
Benedict's solution is used and a color change occurs to orange or red.
Biuret solution is used and a color change to purple or violet occurs.
Emulsion is used and a cloudy suspension is created.
Explanation
The biuret test uses biuret solution to give a violet or purple color change with a positive protein sample.
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