Structure and Properties of Peptides
Hydrogen bonds in a-helices are

roughly parallel to the helix axis
not present at Phe residues
more numerous than Vander Waals interactions
analogous to the steps in a spiral staircase

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Structure and Properties of Peptides
Secondary structure in protein refers to

protein made up of more than one polypeptide chain
linear sequence of amino acids joined together by peptide bond
three dimensional arrangement of all amino acids in polypeptide chain
regular folding of regions of the polypeptide chain

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

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

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