Which of the following is not true of hemoglobin?
A. It makes up about 1/3 of a red blood cell.
B. Each hemoglobin molecule consists of 4 protein subunits.
C. Each hemoglobin molecule can bind to up to 20 oxygen molecules at a time.
D. Oxyhemoglobin is bright red, and deoxyhemoglobin is dark red.
E. All of these are true of hemoglobin.
Answer: C
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