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9 May, 01:26

When biuret solution is used as an indicator, it turns from blue to purple in the presence of which organic molecule?

A) lipid

B) protein

C) nucleic acid

D) carbohydrate

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Answers (2)
  1. 9 May, 01:40
    0
    I believe the answer is b.

    Explanation:

    The biuret solution will turn from blue to purple when it is "infiltrated" with protein.
  2. 9 May, 01:41
    0
    B

    Explanation:

    The biuret solution will turn from blue to purple when it is exposed to protein. The copper sulfate and potassium hydroxide cause the substance to become an alkaline.
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