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# $\alpha$-helix refers to

$\begin {array} {1 1} (A)\;\text{Primary structure of proteins } \\ (B)\;\text{Secondary structure of proteins} \\ (C)\;\text{Tertiary structure of proteins }\\ (D)\;\text{Quarternary structure of proteins} \end {array}$

$\alpha$ helix is one of the secondary structure of protein