(D) The $\alpha$-helix is a common secondary structure found in proteins,where the polypeptide chain is coiled into a right-handed spiral. $DNA$ typic

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(D) The $\alpha$-helix is a common secondary structure found in proteins,where the polypeptide chain is coiled into a right-handed spiral. $DNA$ typically exists as a double helix,while $RNA$ can form various complex structures but is not characterized by the $\alpha$-helix structure found in proteins.