Question

select the correct answer below: primary secondary tertiary quaternary

Explanation:

The image shows alpha helix and pleated sheet structures, which are characteristic of protein secondary structure. Protein secondary structure refers to the local folding of the polypeptide chain into alpha helices and beta - pleated sheets. These structures are stabilized by hydrogen bonds. Primary structure is the linear sequence of amino acids. Tertiary structure is the overall three - dimensional folding of a single polypeptide chain, and quaternary structure is the arrangement of multiple polypeptide chains (subunits) in a multi - subunit protein.

Answer:

secondary