Does peptide bonds are amide linkages, Biology

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Which of the following statements about peptide bonds are true?

Peptide bonds are amide linkages

Peptide bonds form from nucleophillic attack by an electron pair on an alpha-amino nitrogen atom on an alpha-carboxyl carbon atom of another amino acid

Peptides are polymers of protein

A tetrapeptide contains five amino acid residues

Peptide bond formation is a hydrolysis reaction

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