Structure and Properties of Peptides
In the β-pleated sheet

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

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

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