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

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

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

the peptide bond is planar
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 F & Y angles can assume approximately three different values

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