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a
A protein chain is folded in the form of helix throughout its length.
b
A protein chain or polypeptide can be folded as helix at certain regions and folded as Beta- pleated sheet at other regions.
c
Every protein shows quaternary structure.
d
A protein can show its biological activity in its primary structure.
answer is B.
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Detailed Solution
A protein chain is folded in the form of helix at certain regions, as pleated sheet is seen in other regions. In primary structure, the protein can not show its biological activity. Proteins with single polypeptide chain does not show quaternary structure.