What are the distinguishing features between primary, secondary, tertiary, and quatenary structures?
Secondary structures are characterized by a local folding of a polypeptide backbone of amino acids into regular, repeating geometric patterns.
the secondary structure is stablaized by hydrogen bonds between C=O and N-H groups in the peptide bond itself rather than the side chains. Therfore these structures can fom with many amino acid sequences.
Alpha helix, Beta sheets, and loops are all secondary structures.