Structure and Properties of Peptides
Peptides in the fully extended chain conformation

do not occur in nature
are equivalent to the (3-sheet structure
have Y = F = 180°
also have a cis geometry in their peptide bonds

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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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