Amino acids link together end-to-end forming the structure of proteins. chemical properties of amino acid groups within a sequence interact with one another in protein structure resulting in hydrogen bonding and chain folding.

The answer to this question would be: primary structure; secondary structure

Protein is the macromolecule with a complex and unique shape that it was used by white blood cells to determine whether a cell is a foreign cell. Protein can have up to a quarternary structure that will make its 3D structure complex. The primary structure identical with the peptide bond, secondary with the hydrogen bond. 

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