Answer
Myoglobin is all three. The folded structure, the "globin fold" is a motif
found in all globins. The polypeptide folds into a single domain, which for this protein represents the entire three-dimensional structure.
Work Step by Step
The folded structure, the "globin fold" is a motif found in all globins. This analysis technique could be employed to determine whether the polypeptide chains in this protein are similar or different.