Structure and Properties of Peptides
Secondary structure in protein refers to

protein made up of more than one polypeptide chain
regular folding of regions of the polypeptide chain
three dimensional arrangement of all amino acids in polypeptide chain
linear sequence of amino acids joined together by peptide bond

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Structure and Properties of Peptides
In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

two nitrogens of heme and to three His residues in Hb
four nitrogens of heme, the proximal His, and a water molecule
two nitrogens of heme and to three water molecules
four nitrogens of heme and to a water molecule

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