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MCQs

Total Questions : 119 | Page 7 of 12 pages
Question 61.  The organism which grows best above 45°C are called
  1.    psychrophilic
  2.    mesosphilic
  3.    thermophilic
  4.    any of these
 Discuss Question
Answer: Option C. -> thermophilic
Question 62.  The organism which obtain their energy from chemicals are designated as
  1.    prototrophs
  2.    chemotrophs
  3.    organotrophs
  4.    autotrophs
 Discuss Question
Answer: Option B. -> chemotrophs
Question 63.  Lag phase is also known as
  1.    period of initial adjustment
  2.    transitional period
  3.    generation time
  4.    none of these
 Discuss Question
Answer: Option A. -> period of initial adjustment
Question 64. . Which of the following organisms typically get their carbon for biosynthesis from carbon dioxide?
  1.    Glucose-fermenting bacteria (fermentation)
  2.    Anaerobic, glucose-respiring bacteria (anaerobic respiration)
  3.    Aerobic, glucose-respiring bacteria (aerobic respiration)
  4.    Ammonia-oxidizing bacteria (chemolithotrophic bacteria)
 Discuss Question
Answer: Option D. -> Ammonia-oxidizing bacteria (chemolithotrophic bacteria)
Question 65. . Some organisms can use reduced inorganic compounds as electron donors and are termed as
  1.    lithotrophs
  2.    phototrophs
  3.    chemotrophs
  4.    photo-organotrophs
 Discuss Question
Answer: Option A. -> lithotrophs
Question 66. . An organism that expends energy to grow in a habitat with a low water activity in order to maintain internal solute concentrations to retain water is
  1.    osmotolerant
  2.    acidophile
  3.    aerotolerant anaerobe
  4.    alkalophile
 Discuss Question
Answer: Option A. -> osmotolerant
Question 67.  Which of the following is used to grow bacterial cultures continuously?
  1.    Chemostat
  2.    Coulter Counter
  3.    Hemostat
  4.    Petroff-Hausser chamber
 Discuss Question
Answer: Option A. -> Chemostat
Question 68. . The total biomass of an organism will be determined by the nutrient present in the lowest concentration relative to the organism's requirements is a statement of
  1.    Liebig's law of the minimum
  2.    Shelford's law of tolerance
  3.    quorum sensing
  4.    Heisenberg's principle of uncertainty
 Discuss Question
Answer: Option A. -> Liebig's law of the minimum
Question 69. . The growth is normally expressed as __________ in turbidimetric measurement
  1.    cells per ml
  2.    cfu/ml
  3.    optical density
  4.    mg N2 /ml
 Discuss Question
Answer: Option C. -> optical density
Question 70.  A microbe, which grows at temperatures above 95° C is most likely to be
  1.    an archaean
  2.    a fungus
  3.    a protozoan
  4.    none of these
 Discuss Question
Answer: Option A. -> an archaean

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