Question

the structure of human hemoglobin is shown below. it has four polypeptide chains (2 red, 2 blue) as seen in the image. which statements accurately describe the structure in the diagram? select all that apply. this protein shows all levels of protein structure except quaternary structure. this protein shows tertiary structure. this protein shows quaternary structure. this protein shows secondary structure.

Explanation:

Protein structure levels include primary (amino - acid sequence), secondary (alpha - helices and beta - sheets), tertiary (3 - D folding of a single polypeptide), and quaternary (association of multiple polypeptides). Hemoglobin has four polypeptide chains. It shows secondary structure in the form of helices and sheets within each chain, tertiary structure as each chain folds into a 3 - D shape, and quaternary structure as the four chains associate.

Answer:

B. This protein shows tertiary structure
C. This protein shows quaternary structure
D. This protein shows secondary structure