Which of the following has amide links?

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(D) Proteins are naturally occurring polyamides,where amino acids are linked by peptide bonds (amide bonds).Nylon is a synthetic polyamide containing

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All of these

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(D) Proteins are naturally occurring polyamides,where amino acids are linked by peptide bonds (amide bonds).Nylon is a synthetic polyamide containing repeating amide groups $(-CONH-)$ in its backbone.$A$ peptide is a short chain of amino acids connected by peptide bonds,which are essentially amide bonds.Therefore,all of the given options contain amide links.

Amino acid	$pH$ at Isoelectric point
$(Amino \ acid)_{I}$	$6$
$(Amino \ acid)_{II}$	$9.8$
$(Amino \ acid)_{III}$	$3.9$

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The $pH$ at the isoelectric point of three amino acids are given as follows:

Amino acid $pH$ at Isoelectric point

$(Amino \ acid)_{I}$ $6$

$(Amino \ acid)_{II}$ $9.8$

$(Amino \ acid)_{III}$ $3.9$

$(Amino \ acid)_{II}$ is . . . . . . ?

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