Cell Membrane Question

[TheRealAngeleno]

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.

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[OrdinaryDO]

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.

140 x 5 x 2 mm^2....let me re-work this, damnit I forgot the steps it took me.

 

[tn4596]

you got the right answers...convert ur unit