Biuret testshows the presence ofproteins, a positive biuret test appears as violet or purple color, and a negative test appears as light blue color or remain colorless.The Biuret test is a biochemical assay used to detect the presence of proteins. When performing the Biuret test, a solution containing the protein of interest is mixed with a solution containingcopper sulfateandsodium hydroxide. If proteins are present in the solution being tested, a color change occurs, indicating a positive result.Apositive Biuret testappears as avioletorpurplecolor. This color change is due to theformation of acomplexbetween the copper ions in the copper sulfate solution and the peptide bonds in the proteins. The complex absorbs light in the visible spectrum, particularly in the violet region, resulting in the observed color change.On the other hand, anegativeBiuret testappears as alight blue colororremains colorless. This indicates the absence of proteins in the tested solution. In the absence of proteins, the copper ions in the copper sulfate solution do not form the complex with peptide bonds, resulting in no significant color change.Know more aboutBiuret testhere:brainly.com/question/30970600#SPJ11...

Unlock to view answer

Unlock full access for 72 hours, watch your grades skyrocket.

For just $0.99 cents, get access to the powerful quizwhiz chrome extension that automatically solves your homework using AI. Subscription renews at $5.99/week.