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

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

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Structure and Properties of Peptides
The Ramachandran Plot illustrates the fact that

the F & Y angles can assume approximately three different values
the F & Y angles can assume only a single value in a protein
the F & Y angles can assume any value in a peptide
the peptide bond is planar

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