Structure and Properties of Peptides
The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:

Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
Val-Lys-Glu + Met-Ser-Trp-Arg-Ala
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala

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

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
four nitrogens of heme and to a water molecule

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Structure and Properties of Peptides
Hemoglobin has quaternary structure and is made up of

six polypeptide chains, two α-chains and four β-chains
five polypeptide chains, two α-chains and three β-chains
four polypeptide chains, two α-chains and two β-chains
two polypeptide chains, one α-chains and one β-chains

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