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Which one of the following capsid symmetries is found in tobacco mosaic virus?

  • A.Cubic
  • B.Tetrahedral
  • C.Helical
  • D.Icosahedral

Answer: C

In helical symmetry the protein subunits form a helix around the nucleic acid, producing a rod or a filament; tobacco mosaic virus is the classic rigid rod. Flexible helical nucleocapsids occur in paramyxoviruses such as Sendai virus.

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