Question

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

Answer 1

I believe the answer is b.

Step-by-step explanation:

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

Answer 2

B

Step-by-step 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.