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Question

Keratin present in hair shows secondary structure known as

A
Parallel β sheet
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B
Anti-parallel β sheet
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C
α helix
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D
None of these
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Solution

The correct option is C α helix
The primary structure of a protein is a linear polymer with a series of amino acids. Secondary structures of proteins are the spacial arrangements of primary structures. Alpha helices and beta pleated sheets are two types of regular structures.
Fibrous proteins, such as the keratin of your hair, contain almost exclusively primary and secondary structure.
Keratin - alpha helix
Silk fibroin - antiparallel β sheet

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