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Filtration was historically used to distinguish viruses from bacteria because viruses

  • A.grew on the filter surface
  • B.passed through filters that retained bacteria
  • C.were retained by filters that bacteria passed
  • D.dissolved the filter material

Answer: B

Viruses are small enough to cross filters with pores that hold back bacteria, so an infectious agent in the filtrate was originally called a filterable agent. That property, rather than any direct observation, was the first evidence that such agents existed.

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