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Clusters of protein subunits visible on a capsid under the electron microscope are termed

  • A.plasmids
  • B.vacuoles
  • C.capsomeres
  • D.virions

Answer: C

Capsomeres are the oligomeric groupings of structural polypeptides that make up an icosahedral shell and are the repeating units seen in electron micrographs. Counting them was one of the earliest ways of assigning a virus to a family.

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