Structure and Properties of Peptides
In the β-pleated sheet

the polypeptide chain is fully extended
adjacent polypeptide chains can either be parallel or antiparallel
All of these
hydrogen bonds are formed between the peptide bonds

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

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

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