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Plaques in a virus plaque assay are

  • A.clear regions caused by cell death
  • B.colonies of virus particles growing on agar
  • C.clumps of red blood cells
  • D.crystals of purified virus

Answer: A

A plaque forms where an infection has spread through neighbouring cells and killed them, leaving a clear patch in an otherwise intact monolayer. Viruses form no colonies, because they do not grow on media, only in cells.

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