Denaturing is the process of interrupting a protein's structure so that it no longer functions. Which level of structure is NOT affected by denaturing a protein

The primary structure is not affected by denaturing a protein.

Explanation:

Denaturation can be defined as the process in which a protein loses its three-dimensional structure.

This would mean the protein losses its quaternary, tertiary and secondary structure.

However the aminoacid sequence (the primary structure) remains the same.