How does a change in pH affect the structural levels of a protein? Color Tests f

Question

How does a change in pH affect the structural levels of a protein? Color Tests for Proteins: Given their structures, predict the color changes and whether the tests would be positive or negative for the samples below: After working with HNO_3, a student noticed that she had a yellow spot on her hand. What might be the reason? Which samples above give a negative buret test? Why? What functional group gives a positive test in the xanthoproteic test? What tests could you use to determine whether an unlabeled test tube contained an amino acid or a protein?

Explanation / Answer

The skin protein reacted with HNO3. This reaction is called xanthoprotein reaction because in thjs recation Xanthoproteic acid forms when nitric acid reacts with amino acids on the skin. The color of this."Xanthoproteic acid is yellow

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