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The term 'isometric', applied to a virus particle, indicates that it

  • A.is longer than it is wide
  • B.has no regular symmetry at all
  • C.carries an envelope with spikes
  • D.appears equal in its dimensions

Answer: D

Isometric describes a particle whose dimensions are much the same in every direction, which is how an icosahedral capsid looks under the microscope. Helical nucleocapsids are elongated instead, and complex particles fall into neither description.

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