Biuret test is used for the detection of

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(C) The Biuret test is a chemical test used for detecting the presence of peptide bonds,which indirectly indicates the presence of proteins,as protein

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Proteins

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(C) The Biuret test is a chemical test used for detecting the presence of peptide bonds,which indirectly indicates the presence of proteins,as proteins are composed of amino acids linked by peptide bonds. In the presence of peptides,a copper$(II)$ ion forms violet-colored coordination complexes in an alkaline solution. The Biuret reaction is used to assess the concentration of proteins because peptide bonds occur with a consistent frequency per amino acid residue in the peptide chain.

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