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MCQs

Total Questions : 119 | Page 5 of 12 pages
Question 41. The combination of low levels of NaCl, NaNO3 (sodium nitrate), and slightly acid pH can prevent multiplication and toxin formation of
  1.    C. botulinum
  2.    S. aureus
  3.    all of these
  4.    Salmonella
 Discuss Question
Answer: Option C. -> all of these
Question 42. Postgates assay technique is useful in determining if a cell is viable even though it is
  1.    an obligate aerobe
  2.    incapable of cell division
  3.    a thermophile
  4.    too small to see
 Discuss Question
Answer: Option B. -> incapable of cell division
Question 43. Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as
  1.    chemo-lithotrophs
  2.    chemotrophs
  3.    fastidious hetrotrophs
  4.    photo-organotrophs
 Discuss Question
Answer: Option C. -> fastidious hetrotrophs
Question 44. What are the extrinsic factors for the microbial growth?
  1.    storage temperature
  2.    all of these
  3.    composition of gas phase
  4.    humidity
 Discuss Question
Answer: Option B. -> all of these
Question 45. Quantitative measurement of bacterial growth can be carried out by measuring
  1.    all of these
  2.    cell mass
  3.    cell count
  4.    cell activity
 Discuss Question
Answer: Option A. -> all of these
Question 46. All organisms require at least small amounts of carbondioxide, However, some can use CO2 as their sole source of carbon. Such organisms are termed as
  1.    chemotrophs
  2.    photo-organotrophs
  3.    phototrophs
  4.    autotrophs
 Discuss Question
Answer: Option D. -> autotrophs
Question 47. The generation time of a culture that produces two generations per hour is
  1.    None of these
  2.    greater than that produces three generations per hour
  3.    lesser than that produces three generations per hour
  4.    equal to that produces three generations per hour
 Discuss Question
Answer: Option B. -> greater than that produces three generations per hour
Question 48. Which of the following organisms typically get their carbon for biosynthesis from organic compounds?
  1.    Photosynthetic cyanobacteria (phototrophic metabolism)
  2.    Ammonia-oxidizing bacteria (chemolithotrophic bacteria)
  3.    Aerobic, glucose-respiring bacteria (aerobic respiration)
  4.    None of these
 Discuss Question
Answer: Option C. -> Aerobic, glucose-respiring bacteria (aerobic respiration)
Question 49. Autotrophic bacteria are those which
  1.    form a long chain glycocalyx
  2.    make their own food
  3.    produce a blue-green pigment
  4.    are highly susceptible to penicillin
 Discuss Question
Answer: Option B. -> make their own food
Question 50. Bacteria of genus Nitrosomonas use __________ as their electron source.
  1.    ammonia
  2.    H2S
  3.    light
  4.    succinate
 Discuss Question
Answer: Option A. -> ammonia

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