Structure and Properties of Peptides
In β-pleated sheet structures neighbouring

neighboring chains are connected by a-helices
chains lie in a flat plane
neighboring chains are hydrogen bonded
neighboring residues are hydrogen bonded

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

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