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MCQs

Total Questions : 339 | Page 8 of 34 pages
Question 71. In which of the following situations will the logarithmic plot of survivors be constant?
  1.    physiological conditions are different
  2.    cells of microbial population vary in size
  3.    age and physiological conditions are uniform
  4.    temperature conditions are different
 Discuss Question
Answer: Option C. -> age and physiological conditions are uniform
Answer: (c).age and physiological conditions are uniform
Question 72. Which of the following is the example of Gram-negative bacteria?
  1.    Lactobacillus
  2.    Eschericia coli
  3.    Staphylococcus aureus
  4.    Bacillus subtilis
 Discuss Question
Answer: Option B. -> Eschericia coli
Answer: (b).Eschericia coli
Question 73. A suspension of E.coli exposed to a heat treatment may yield a greater number of survivors if a plating medium of _____________ is used.
  1.    peptone
  2.    trypticase soy agar
  3.    deoxycholate agar
  4.    potato dextrose
 Discuss Question
Answer: Option B. -> trypticase soy agar
Answer: (b).trypticase soy agar
Question 74. Which of the staining technique helps in demonstrating spore structure in bacteria as well as free spores?
  1.    Acid-fast stain
  2.    Endospore stain
  3.    Capsule stain
  4.    Flagella stain
 Discuss Question
Answer: Option B. -> Endospore stain
Answer: (b).Endospore stain
Question 75. In Gram-staining, iodine is used as a______________
  1.    fixative
  2.    mordant
  3.    solublizer
  4.    stain
 Discuss Question
Answer: Option B. -> mordant
Answer: (b).mordant
Question 76. We require less time to kill the population of many cells.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 77. Which of the following show the maximum resistance to physical and chemical agents?
  1.    Viruses
  2.    Mold spores
  3.    Bacterial spores
  4.    E.coli
 Discuss Question
Answer: Option C. -> Bacterial spores
Answer: (c).Bacterial spores
Question 78. The effectiveness of heat in killing microorganisms is much greater in _____________
  1.    acid
  2.    alkali
  3.    neutral
  4.    acid and alkali
 Discuss Question
Answer: Option A. -> acid
Answer: (a).acid
Question 79. A high concentration of which of the following compounds in the material generally increases the thermal resistance of microorganisms?
  1.    proteins
  2.    carbohydrates
  3.    lipids
  4.    salts
 Discuss Question
Answer: Option B. -> carbohydrates
Answer: (b).carbohydrates
Question 80. How much time is required by the young cells to be killed by a lethal agent?
  1.    24 hours
  2.    3-4 hours
  3.    30 mins
  4.    5 mins
 Discuss Question
Answer: Option C. -> 30 mins
Answer: (c).30 mins

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