Final answer:
The secondary protein structure depends on interactions involving the R groups of amino acids. These interactions include hydrogen bonding, ionic bonding, and hydrophobic interactions.
Step-by-step explanation:
The statement 'Secondary protein structure depends on interactions involving the R groups of amino acids' is true.
The tertiary structure of a protein is formed by interactions among the R groups of amino acids. These interactions can include hydrogen bonding, ionic bonding, and hydrophobic interactions. For example, R groups with like charges repel each other, while those with unlike charges are attracted to each other. The hydrophobic R groups of nonpolar amino acids tend to lie in the interior of the protein, while the hydrophilic R groups lie on the outside.
Overall, the R groups of amino acids play a crucial role in determining the three-dimensional structure of a protein.