The Interaction of Two or More Polypeptide Chains in a Hemoglobin

Question

The interaction of two or more polypeptide chains in a hemoglobin molecule is its ____ structure.  
A) primary
B) secondary
C) tertiary
D) quaternary
E) combined

Accepted Answer

The interaction of two or more polypeptide chains in a hemoglobin molecule is its quaternary structure. Hemoglobin consists of four polypeptide subunits: two alpha chains and two beta chains. The association of these subunits forms the quaternary structure of hemoglobin.