Morphology

• Which of the following morphologic forms are seen in Naegleria fowleri?a)Ameboid trophozoites, flagellate forms, and cystsb) Ameboid trophozoites and flagellate forms onlyc) Ameboid trophozoites and cysts onlyd) Flagellate forms and cysts only


  Ameboid trophozoites, flagellate forms, and cysts
• What is the typical size range of the ameboid trophozoites of N. fowleri?

  8 to 22 µm
• How is motility accomplished by the N. fowleri ameboid trophozoites?

  Blunt pseudopodia
• Where is the nucleus located in the N. fowleri ameboid trophozoites?

   Centrally located
• Which of the following is a characteristic of the cytoplasm in N. fowleri ameboid trophozoites?

  Vacuolated
• What is the shape of the flagellate forms of N. fowleri?

  Pear-shaped
• How many flagella extend from the broad end of N. fowleri flagellate forms?

  Two
• How is motility achieved by N. fowleri flagellate forms?

  Jerky movements or spinning
• Where in the organism is the nucleus located in N. fowleri flagellate forms?

  Centrally located
• What is the cytoplasmic appearance of N. fowleri flagellate forms?

   Granular
• What is the size range of N. fowleri cysts?

  9 to 12 µm
• What is the shape of N. fowleri cysts?

  Round
• What is the characteristic of the cell walls in N. fowleri cysts?

  Thick
• How many nuclei are present in N. fowleri cysts?

   One
• Where is the nucleus located in N. fowleri cysts?

  Centrally located
• What is the appearance of the cytoplasm in N. fowleri cysts?

  Granular
• What is the typical length range of the ameboid trophozoites of N. fowleri?

  15 to 20 µm
• Which of the following is NOT a characteristic of N. fowleri flagellate forms?a)Pear-shapeb) Motility by jerky movements or spinningc) Single flagellumd) Granular cytoplasm

  Single flagellum
• What is the primary function of the thick cell walls in N. fowleri cysts?

   Protection against environmental factors