Answer:
The correct answer is - Secondary structure.
Explanation:
Proteins are made up of the long polypeptide chain made up of the amino acid sequences. Folds of the primary structure makes the secondary structure. It is a three-dimensional structure of the protein.
Two common tyoe of the secondary structure of proteins is beta-sheets and alpha-helices. Omega loops and beta turns, exist as well in this category of protein.
Thus, the correct answer is - secondary structure.
