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Internally, a poxvirus virion contains

  • A.a circular genome with no protein core
  • B.a dumbbell-shaped core and two lateral bodies
  • C.a helical nucleocapsid and a matrix layer
  • D.an icosahedral core and a single lateral body

Answer: B

The core holds the genome and takes a dumbbell shape, with two lateral bodies filling the concavities on either side. This internal organisation is one reason the family is classed as having complex rather than helical or icosahedral symmetry.

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