(D) The Biuret test is a chemical test used for detecting the presence of peptide bonds.In the presence of peptides,a copper $II$ ion $(Cu^{2+})$ form

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(D) The Biuret test is a chemical test used for detecting the presence of peptide bonds.In the presence of peptides,a copper $II$ ion $(Cu^{2+})$ forms a violet-colored complex in an alkaline solution.The reaction is represented as:$(-CH(R)-CO-NH-)_{n} + Cu^{2+} \rightarrow \text{Violet Complex}$