The three-dimensional structure of an active hemoglobin (heterotetramer)structure would be referred to as its:
A)primary structure.
B)secondary structure.
C)tertiary structure.
D)quaternary structure.
E)quinternary structure.

Question

Quizplus · Accepted Answer

The quaternary structure describes the three-dimensional arrangement of multiple protein subunits (in this case, four polypeptide chains) that are assembled into a functional protein complex. Hemoglobin is composed of four subunits: two alpha chains and two beta chains. Therefore, the three-dimensional structure of an active hemoglobin would be referred to as its quaternary structure. The primary structure refers to the linear sequence of amino acids, the secondary structure refers to the local folding patterns such as alpha helices and beta sheets, and the tertiary structure refers to the overall 3-dimensional conformation of a single polypeptide chain. Quinternary is not a recognized term in biochemistry.

The Three-Dimensional Structure of an Active Hemoglobin (Heterotetramer)structure Would Be