Which Feature Characterizes Hemoglobin

Multiple Choice

Which feature characterizes hemoglobin?

A) It is a lead-containing molecule in the red blood cells of vertebrates that transports O₂.
B) It can bind up to six O₂ molecules.
C) It consists of two polypeptide subunits.
D) Its capacity for transporting O₂ is slightly less than that of plasma.
E) It binds carbon monoxide (CO) much more readily than it binds O₂.