Hemoglobin Molecules Consist of ________ Globular Protein Subunits

Question

Hemoglobin molecules consist of ________ globular protein subunits.
A) two
B) four
C) eight
D) sixteen
E) thirty-two

Accepted Answer

Hemoglobin molecules consist of four globular protein subunits, each containing a heme group that binds to an iron atom. This allows hemoglobin to bind to oxygen molecules and transport them throughout the body.