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MCQs

Total Questions : 119 | Page 4 of 12 pages
Question 31. The term facultative anaerobe refers to an organism that
  1.    uses oxygen when present or grows without oxygen when absent
  2.    is killed by oxygen
  3.    doesn't use oxygen but tolerates it
  4.    requires less oxygen than is present in air
 Discuss Question
Answer: Option A. -> uses oxygen when present or grows without oxygen when absent
Question 32. The microorganisms that grow best in a low-oxygen environment is called a (n)
  1.    microaerophile
  2.    anaerobe
  3.    aerobe
  4.    facultative
 Discuss Question
Answer: Option A. -> microaerophile
Question 33. A synergistic effect is observed when
  1.    one organism removes an inhibitory substance for another
  2.    All of these
  3.    microbial alteration of pH, aw, Eh favours the growth of another
  4.    one organism produces a growth factor utilized by another
 Discuss Question
Answer: Option B. -> All of these
Question 34. Generation time is
  1.    time required for the population to double
  2.    time required for the initial adjustment
  3.    both (a) and (c)
  4.    obtained by expression t/n, where t = time interval, n = number of generation
 Discuss Question
Answer: Option C. -> both (a) and (c)
Question 35. Pseudomonas pseudoflava can grow as
  1.    both (a) and (b)
  2.    chemo-lithotrophs
  3.    none of these
  4.    chemo-organotrophs
 Discuss Question
Answer: Option A. -> both (a) and (b)
Question 36. 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.    organism cannot produce superoxide dismutase and/or catalase
  2.    organism can tolerate oxygen
  3.    organism should be grown in an anaerobic chamber
  4.    broth is sterile
 Discuss Question
Answer: Option A. -> organism cannot produce superoxide dismutase and/or catalase
Question 37. In the exponential phase, the cells and cell mass
  1.    first increases then decreases
  2.    double at a constant rate
  3.    decreases
  4.    are constant
 Discuss Question
Answer: Option B. -> double at a constant rate
Question 38. 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 39. What is the primary source of food for marine life?
  1.    Sea weed
  2.    Zooplankton
  3.    Phytoplankton
  4.    Grass
 Discuss Question
Answer: Option C. -> Phytoplankton
Question 40. Exponential phase of growth curve of bacteria is of limited duration because of
  1.    all of these
  2.    rise in cell density
  3.    accumulation of toxic metabolites
  4.    exhaustion of nutrients
 Discuss Question
Answer: Option A. -> all of these

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