Question

How amino acids are linked to form a long chain

Answer 1

Amino Acids Are Linked by Peptide Bonds to Form Polypeptide Chains. Proteins are linear polymers formed by linking the α-carboxyl group of one amino acid to the α-amino group of another amino acid with a peptide bond (also called an amide bond).

Answer 2

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In a long chain of amino acids, the amino group of one amino acid is linked by peptide linkage to the carboxyl group of the other amino acid.