The following shows a protein with mostly beta sheet secondary structures.  Which force stabilizes the beta sheet secondary structure of proteins?   hydrophobic interactions between nonpolar amino acid side chains within the protein.   electrostatic interactions between lysine and aspartic acid residues within the protein.   hydrogen bonding between hydrogen bond donors and hydrogen bond acceptors of the peptide backbone.   covalent disulfide linkages between cysteine residues within the protein.

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