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MCQs

Total Questions : 119 | Page 10 of 12 pages
Question 91. . The term facultative anaerobe refers to an organism that
  1.    doesn't use oxygen but tolerates it
  2.    is killed by oxygen
  3.    uses oxygen when present or grows without oxygen when absent
  4.    requires less oxygen than is present in air
 Discuss Question
Answer: Option C. -> uses oxygen when present or grows without oxygen when absent
Question 92. . Which of the following is the suitable temperature range for mesophiles?
  1.    20-30°C
  2.    25-40°C
  3.    >40°C
  4.    None of these
 Discuss Question
Answer: Option B. -> 25-40°C
Question 93. . A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the
  1.    broth is sterile
  2.    organism can tolerate oxygen
  3.    organism cannot produce superoxide dismutase and/or catalase
  4.    organism should be grown in an anaerobic chamber
 Discuss Question
Answer: Option C. -> organism cannot produce superoxide dismutase and/or catalase
Question 94. . Exponential phase of growth curve of bacteria is of limited duration because of
  1.    rise in cell density
  2.    accumulation of toxic metabolites
  3.    exhaustion of nutrients
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 95. . In the exponential phase, the cells and cell mass
  1.    first increases then decreases
  2.    decreases
  3.    are constant
  4.    double at a constant rate
 Discuss Question
Answer: Option D. -> double at a constant rate
Question 96. . What is the primary source of food for marine life?
  1.    Phytoplankton
  2.    Zooplankton
  3.    Sea weed
  4.    Grass
 Discuss Question
Answer: Option A. -> Phytoplankton
Question 97. . Postgates assay technique is useful in determining if a cell is viable even though it is
  1.    incapable of cell division
  2.    too small to see
  3.    an obligate aerobe
  4.    a thermophile
 Discuss Question
Answer: Option A. -> incapable of cell division
Question 98. . What are the extrinsic factors for the microbial growth?
  1.    humidity
  2.    storage temperature
  3.    composition of gas phase
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 99. . Quantitative measurement of bacterial growth can be carried out by measuring
  1.    cell count
  2.    cell mass
  3.    cell activity
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 100. . The combination of low levels of NaCl, NaNO3 (sodium nitrate), and slightly acid pH can prevent multiplication and toxin formation of
  1.    Salmonella
  2.    S. aureus
  3.    C. botulinum
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these

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