Final answer:
The tertiary structure of proteins refers to their unique three-dimensional shape, which is important for their proper functioning. Insulin is an example of a protein with a specific tertiary structure.
Step-by-step explanation:
Tertiary structure refers to the unique three-dimensional shape of the protein as a whole, which results from the folding and bending of the protein backbone.
The tertiary structure is intimately tied to the proper biochemical functioning of the protein.
For example, insulin has a specific tertiary structure that allows it to bind to its receptor and regulate blood sugar levels.