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

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

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

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