Discussion
Filtration sterilizes a solution by
Answer: A
Correct answer: removing the organisms rather than killing them
A membrane filter of 0.22 micrometre pore size retains bacteria and fungi physically, so the filtrate is free of them while nothing has been killed. That is why filtration is used for heat-labile solutions - sera, antibiotic solutions, vitamins - and why it is not reliable against viruses or mycoplasmas, which are small enough to pass.
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