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The linkage joining two amino acids in a protein is

Aa phosphodiester bond
Ban ester bond, $- CO - O X^{-}$
Ca glycosidic bond, $C - O - C$
Da peptide (amide) bond, $- CO - NH X^{-}$

Answer: D

The carboxyl group of one amino acid condenses with the amino group of the next with loss of water, forming the amide linkage

- CO - NH X^{-}

called the peptide bond.

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