Answer:
(a) 1° structure refers to
sequence of amino acids present in protein.
2° structure
refers to the shape in which a long polypeptide chain can exist.
(b) In a-helix
a polypeptide chain forms all possible hydrogen bonds by twisting into helix.
In 
pleated sheet structure all
peptide chains are stretched out to nearly maximum extension. And then laid
side by side which are held by intermolecular H - bond.
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