Peptide linkage is present in:

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(D) peptide linkage is an amide bond formed between the carboxyl group $(-COOH)$ of one amino acid and the amino group $(-NH_2)$ of another amino acid

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All of these

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(D) peptide linkage is an amide bond formed between the carboxyl group $(-COOH)$ of one amino acid and the amino group $(-NH_2)$ of another amino acid.$1$. Proteins are polymers of amino acids linked by peptide bonds.$2$. Nylon-$66$ is a polyamide formed by the condensation polymerization of hexamethylenediamine and adipic acid,containing amide linkages $(-CONH-)$,which are chemically identical to peptide linkages.$3$. Biurides (or biurets) are compounds containing the $-NH-CO-NH-CO-NH_2$ group,which also contain amide linkages.Therefore,all the given options contain amide/peptide linkages.

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