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a. Side groups interact to form disulfide bonds or ionic bonds.b. Peptide bonds join amino acids in a polypeptide chain.c. Several polypeptides are held together by hydrogen bonds between adjacent chains.d. Hydrogen bonding between carbonyl oxygen atoms and nitrogen atoms of amide groups causes a polypeptide to coil.e. Hydrophobic side chains seeking a nonpolar environment move toward the inside of the folded protein.f. Protein chains of collagen form a triple helix.g. An active protein contains four tertiary subunits.
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