Structure and Properties of Peptides
In the β-pleated sheet

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

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

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Structure and Properties of Peptides
Secondary structure in protein refers to

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

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