State whether the following statements apply to primary, secondary, tertiary, or quaternary protein structure:
a. R groups interact to form disulfide bonds or ionic bonds.
b. Peptide bonds connect amino acids in a polypeptide chain.
c. Several polypeptides are held together by hydrogen bonds between adjacent chains.
d. Hydrogen bonds occur between the O atoms of carbonyl groups and the H atoms bonded to the N atoms in the amide groups to give a coiled shape.
e. Hydrophobic R groups 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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