-helix
and 
-pleated
structure.
Answer:
The secondary structure of protein refers to the shape
inwhich a long polypeptide chain can exist. Secondary structure is of twotypes:
(i) 
-helix In a-helix,
a polypeptide chain forms all possiblehydrogen bonds by twisting into a right
handed screw (helix) with the
group of each amino
acid residue hydrogen bonded to the 
of an adjacent turn of
the helix.
(ii) 
-pleated structure
In -pleated
structure, all peptide chains arestretched out to nearly maximum extension and
then laid side byside which are held together by intermolecular hydrogen
bonds.The structure resembles the pleated folds of drapery and also called -pleated
sheet
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