What functional groups are found in proteins?

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Solution

The one functional group that is found in all proteins is the amide group or peptide bond.

In addition, proteins may contain a wide range of functional groups in the sidechains of the amino acid residues:
$∙$ alcoholic OH groups in serine and threonine
$∙$ phenolic OH groups in tyrosine
$∙$ SH groups in cysteine
$∙$ COO groups in aspartic and glutamic acids
$∙$ ${N H}_{2}$ groups in lysine
$∙$ CONH2 groups in asparagine and glutamine

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