decide is each statement is referring to primary, secondary, tertiary, or quaternary structures of proteins:

The statement refers to **tertiary structure**. Tertiary structure refers to the overall three-dimensional shape of a polypeptide, which is primarily determined by interactions between the R-groups (side chains) of the amino acids. This level of structure is crucial for the function of many proteins, and in some cases, it can represent the final functional form of proteins that are composed of a single polypeptide chain.