Normal Flora and the Human Host MCQ

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• Which of the following microorganism produces colicins in the intestine?
  ক

  E.coli

  খ

  B.subtilis

  গ

  Clostridium botulinum

  ঘ

  Streptococcus salivarius
• Where does the Streptococcus mutans adhere to the body site?
  ক

  intestinal tract

  খ

  tongue

  গ

  teeth

  ঘ

  hairs
• Pseudomembranous colitis is caused by the strains of which of the following microorganism?
  ক

  Streptococcus mutans

  খ

  Clostridium difficile

  গ

  Streptococcus salivarius

  ঘ

  Clostridium botulinum
• Germ-free animals require lower levels of B vitamins.
  ক

  True

  খ

  False
• Which of the following vitamins are not required by normal animals?
  ক

  Vit K

  খ

  Vit B

  গ

  Vit C

  ঘ

  Vit A
• Which among the following was the first germ-free animal to be reared?
  ক

  guinea pigs

  খ

  rats

  গ

  chickens

  ঘ

  monkey
• How many day-old embryonated eggs were used by Reyniers to rear first germ-free animals?
  ক

  20

  খ

  50

  গ

  2

  ঘ

  7
• Animals that are contaminated with germs are said to be gnotobiotic.
  ক

  True

  খ

  False
• Within how many days after birth a stable flora develops?
  ক

  1 day

  খ

  7 days

  গ

  30 days

  ঘ

  7-14 days
• Who among the following was successful in raising 17 germ-free chickens for 40 days?
  ক

  Pasteur

  খ

  Schottelius

  গ

  Cohendy

  ঘ

  Reyniers