Final answer:
The quaternary structure of 2QYC is a heterotetramer, which means it consists of four polypeptides held together by non-covalent interactions.
Step-by-step explanation:
The quaternary structure of 2QYC is a heterotetramer. Quaternary structure describes a protein composed of two or more polypeptides, and in this case, 2QYC is made up of different subunits. A heterotetramer consists of four polypeptides held together by non-covalent interactions, such as hydrogen bonds, ionic bonds, or Vander Waals' forces.