The figure below shows that ______.
A) hemoglobin can bind to either oxygen or carbon dioxide
B) a hemoglobin molecule can bind up to four molecules of oxygen
C) a red blood cell contains four hemoglobin molecules
D) each iron atom can bind four oxygen molecules

Question

The figure below shows that ______. 
A) hemoglobin can bind to either oxygen or carbon dioxide 
B) a hemoglobin molecule can bind up to four molecules of oxygen 
C) a red blood cell contains four hemoglobin molecules 
D) each iron atom can bind four oxygen molecules

Quizplus · Accepted Answer

The figure shows that each hemoglobin molecule can bind up to four molecules of oxygen. This is represented by the four oxygen molecules that are bound to the iron atoms in the heme groups of the hemoglobin molecule. There is no information in the figure to suggest that hemoglobin can bind to carbon dioxide, or that a red blood cell contains four hemoglobin molecules, or that each iron atom can bind four oxygen molecules.

The Figure Below Shows That ______