Understanding Protein Tertiary Structure

Proteins are essential biological molecules that play a variety of roles in living organisms. They are composed of long chains of amino acids that fold into specific three-dimensional structures. The sequence of amino acids is determined by the nucleic acid sequence in genes. In this context, consider the following statement related to the formation and properties of proteins:

"The interaction between the side chains of amino acids can lead to various structural levels of proteins, including primary, secondary, tertiary, and quaternary structures."

Based on this information, which of the following statements best describes a characteristic of a protein's tertiary structure?