Answer:
There are four levels of protein structure which includes primary, secondary, tertiary, and quaternary.
Step-by-step explanation:
Primary structure establishes the sequence for amino acids which are the building blocks of proteins.
Secondary structure focuses on sub-structure within a polypeptide chain.
The tertiary structure describes monomeric and multimeric molecules of protein in a three-dimensional structure.
The quaternary structure describes the macromolecule of a protein formed through combination of various polypeptide chains.