biology question?

Question

A student heats a test tube containing a large amount of protein and Biuret reagent. She notices a color change from violet to blue. Explain why heating causes a color change.

Answer 1

Heating disrupts the proteins' form and conglomeration (if that's the word for it, not sure).

Basically, the protein's structure changes, which means it will react differently with the reagent, and hence the color change.