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Discussion

Adenoviruses and polioviruses both show

  • A.icosahedral symmetry
  • B.helical symmetry
  • C.complex symmetry
  • D.no regular symmetry

Answer: A

Both build closed icosahedral shells, as does hepatitis A virus. Helical symmetry is the alternative basic plan, seen in tobacco mosaic virus and the rhabdoviruses, while poxviruses are the standard example of a complex architecture belonging to neither class.

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