Which one of the following statements is CORRECT? O The B-sheet is stabilized by ionic interactions between the side chains of amino acids. O The a-helix can be composed of more than one polypeptide...

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Extracted text: Which one of the following statements is CORRECT? O The B-sheet is stabilized by ionic interactions between the side chains of amino acids. O The a-helix can be composed of more than one polypeptide chain. O The a-helix is stábilized by hydrogen bonds between C=O and -NH- of the peptide backbone. O B-sheets exist only in fibrous proteins.