The alpha-helix and beta-pleated sheet are characteristic of:

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Quizplus · Accepted Answer

The alpha-helix and beta-pleated sheet are both secondary protein structures, which refer to the regular folding patterns of the polypeptide backbone stabilized by hydrogen bonds between amino acids. Primary protein structure refers to the linear sequence of amino acids, tertiary protein structure refers to the three-dimensional folding of the polypeptide chain, and quaternary protein structure refers to the arrangement of multiple polypeptide chains in a protein complex.

The Alpha-Helix and Beta-Pleated Sheet Are Characteristic Of