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Actinomycetes are best described as

  • A.True fungi with septate and branching hyphae
  • B.Colourless algae living below the surface
  • C.Protozoa that engulf bacteria as their food
  • D.Bacteria that grow as branching filaments

Answer: D

Actinomycetes are prokaryotes, so despite the filamentous growth habit that once had them classed with fungi they are bacteria: they have no nucleus, their filaments are far narrower than fungal hyphae and their cell walls contain peptidoglycan rather than chitin.

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