Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

lysine residues in the protein
the iron atom in the heme group
the nitrogen atoms on the heme
histidine residues in the protein

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Structure and Properties of Peptides
Secondary structure in protein refers to

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

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