![]() The third level of protein structure is the tertiary structure. As previously stated, hydrogen bonds stabilize all of these shapes. These shapes include alpha helix, beta-pleated sheet, and beta-turn. The second level of protein structure is the secondary structure, and it consists of the various shapes form via hydrogen bonding. This structure also has the name of the protein backbone. These linkages have designated carbon atom positions of alpha, beta, and gamma, which correspond to specific positions relative to the peptide linkage. All of the residues connect via peptide bonds. It is composed of the linear order of amino acid residues. ![]() The first level is the primary structure because it is the most basic level of protein structure. Proteins can be further defined by their four structural levels: primary, secondary, tertiary, and quaternary. ![]() Proteins serve as structural support, biochemical catalysts, hormones, enzymes, building blocks, and initiators of cellular death. Proteins are biopolymeric structures composed of amino acids, of which there are 20 commons found in biological chemistry.
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