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Tobacco mosaic virus is a virus of

  • A.icosahedral symmetry with a DNA genome
  • B.complex symmetry with a segmented genome
  • C.helical symmetry with a DNA genome
  • D.helical symmetry with an RNA genome

Answer: D

It is the classic rigid helical rod, built of identical subunits spiralling around a single positive-sense RNA strand. Its stability and simple construction are why it was the first virus to be crystallised and a mainstay of early structural virology.

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