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A Sendai virus nucleocapsid is described as about

  • A.17 nm in every dimension
  • B.1000 nm long and 17 nm in diameter
  • C.17 nm long and 1000 nm in diameter
  • D.1000 nm in every dimension

Answer: B

The nucleocapsid is long and very thin, which is characteristic of helical symmetry: the length follows the length of the genome while the diameter is fixed by the coat protein. It is coiled inside the envelope, so the particle appears far more compact than the figure suggests.

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