Final answer:
A denatured protein is a protein that has become nonfunctional due to the loss of its three-dimensional structure.
Step-by-step explanation:
An denatured protein is a protein that has become nonfunctional due to the loss of its three-dimensional structure. The process by which a polypeptide chain assumes a large-scale, three-dimensional shape is called protein folding. When a protein loses its three-dimensional shape, it may no longer be functional.