Which of the following statements is not true of hemoglobin?
A) Each red blood cell has between 200 million and 300 million molecules of hemoglobin.
B) The hemoglobin in a red blood cell makes up about 70% of the cell's dry weight.
C) It has four globin and four heme chains in each molecule.
D) All of the above statements are true of hemoglobin.
