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Cell Membrane Question

Discussion in 'MCAT Study Question Q&A' started by TheRealAngeleno, Aug 7, 2011.

  1. TheRealAngeleno

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    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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  3. OrdinaryDO

    OrdinaryDO Membership Revoked
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    140 x 5 x 2 mm^2....let me re-work this, damnit I forgot the steps it took me.
     
  4. tn4596

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    you got the right answers...convert ur unit
     

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