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Kaplan Qbank USMLE



Author2 Posts
  #1

Which of the following contaiminants will be removed from a fluid passed through a 0.45u filter?
A. herpes simplex virus
B. HIV protease
C. Lipopolysaccharide
D. Mycoplasma hominis
E. Staphylococcus aureus

  #2

E. Staph Aureus. Its too big, so it is left behind when u pass the fluid from a 0.45u pore.

a.and d. Herpes, and mycolplasma are the same size. ( Viruses are minute 0.02-0.3Microns) hence, they pass thru the 0.45 pore.
mycolplasma is one of those very small bacteris i.e. ricketssia,
chlamydia and mycolplasma.
b. HIV, a retroviridae is smaller than herpes...about 120 nanometers...(herpes n mycoplasma are 150nm)

c. Lipopolysaccharide ..Dont exactly know about this, but I'm thinking in the lines that since, its just a PART of the bacteria, it can be ruled out because it must definitely pass through a 0.45u pore.

Any other suggestions?



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