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An oligomeric cluster of coat protein subunits, visible as a structural unit of an icosahedral capsid, is a

  • A.capsomere
  • B.protomer
  • C.virion
  • D.nucleocapsid

Answer: A

Individual subunits are protomers, and they gather into capsomeres, which are what electron microscopy resolves on the capsid surface. Counting capsomeres was historically one way of characterising a virus. The nucleocapsid is the capsid with the genome inside it.

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