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In a helical virus, the length of the nucleocapsid is set by

  • A.the thickness of the envelope
  • B.the size of the host cell
  • C.the length of the nucleic acid it encloses
  • D.the number of capsomeres in a fixed shell

Answer: C

Protomers add along the genome, so a longer genome gives a longer particle while the diameter stays fixed. An icosahedral capsid behaves the other way: it is a closed container of set size, which limits how much nucleic acid will fit.

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