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
regular folding of regions of the polypeptide chain
three dimensional arrangement of all amino acids in polypeptide chain

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

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

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