A red blood cell has a surface area if 140um^2. A sample of 1 mL of blood, containing about 5 million blood cells is extracted with an organic solvent. When the lipid fraction is purified, approximately what surface area will be found? A. 700 um^2 B. 1400 um^2 C. 700 mm^2 D. 1400 mm^2 I solved it by multiplying 5x10^6 x 140 um^2 x 2 (Since the cell membrane is a bilayer) = 1400 x 10^6 um^2 but the answer is D. Could someone give it a try and explain the thought process you used? Thanks.