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The common word for bacteria which are helically curved rods is

  • A.cocci
  • B.pleomorphic
  • C.bacillus
  • D.spirilla

Answer: D

Correct answer: spirilla

Spirilla are rigid helically curved rods, moved by polar flagella. Spirochaetes are the flexible helical forms, driven by internal axial filaments; cocci are spherical and bacilli straight rods.

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