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

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.

I believe the answer is b.

Explanation:

The biuret solution will turn from blue to purple when it is "infiltrated" with protein.

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