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

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

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Structure and Properties of Peptides
Secondary structure in protein refers to

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

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