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(A) The secondary structure of proteins refers to the shape in which a long polypeptide chain can exist. There are two types of secondary structures:

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Secondary structure

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(A) The secondary structure of proteins refers to the shape in which a long polypeptide chain can exist. There are two types of secondary structures: the $\alpha-$helix and the $\beta-$pleated sheet. In the $\beta-$pleated sheet structure,all polypeptide chains are stretched out to nearly maximum extension and then laid side-by-side,which are held together by intermolecular hydrogen bonds.

Amino acid	$pH$ at Isoelectric point
$(Amino \ acid)_{I}$	$6$
$(Amino \ acid)_{II}$	$9.8$
$(Amino \ acid)_{III}$	$3.9$

$\beta-$pleated sheets of polypeptide chains are present in

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