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In the natural structure known as a β-sheet...?

a. a peptide strand winds into a column that is held together by internal H-bonds.

b. the amide groups of two peptide strands H-bond to form a non-covalent


c. two peptide strands form a ladder-like structure that twists like a spiral


d. three or more peptide chains form a structure that is also referred to as an


e. None of the above is correct.

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