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MCQs

Total Questions : 119 | Page 11 of 12 pages
Question 101. . Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as
  1.    fastidious hetrotrophs
  2.    chemo-lithotrophs
  3.    chemotrophs
  4.    photo-organotrophs
 Discuss Question
Answer: Option A. -> fastidious hetrotrophs
Question 102. . Autotrophic bacteria are those which
  1.    make their own food
  2.    form a long chain glycocalyx
  3.    are highly susceptible to penicillin
  4.    produce a blue-green pigment
 Discuss Question
Answer: Option A. -> make their own food
Question 103. . Bacteria of genus Nitrosomonas use __________ as their electron source.
  1.    ammonia
  2.    H2S
  3.    succinate
  4.    light
 Discuss Question
Answer: Option A. -> ammonia
Question 104. . The generation time of a culture that produces two generations per hour is
  1.    greater than that produces three generations per hour
  2.    lesser than that produces three generations per hour
  3.    equal to that produces three generations per hour
  4.    none of the above
 Discuss Question
Answer: Option A. -> greater than that produces three generations per hour
Question 105. . 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.    autotrophs
  2.    phototrophs
  3.    chemotrophs
  4.    photo-organotrophs
 Discuss Question
Answer: Option A. -> autotrophs
Question 106. . The period between inoculation of bacteria in a culture medium and beginning of multiplication is known as
  1.    stationary phase
  2.    log phase
  3.    lag phase
  4.    decline phase
 Discuss Question
Answer: Option C. -> lag phase
Question 107. . Microaerophilic bacteria are those which require
  1.    21 % oxygen for growth
  2.    low levels of oxygen for growth (lesser than O2 present in atmosphere)
  3.    oxygen for activation of enzymes
  4.    none of the above
 Discuss Question
Answer: Option B. -> low levels of oxygen for growth (lesser than O2 present in atmosphere)
Question 108. . Which of the following organisms typically get their carbon for biosynthesis from organic compounds?
  1.    Aerobic, glucose-respiring bacteria (aerobic respiration)
  2.    Ammonia-oxidizing bacteria (chemolithotrophic bacteria)
  3.    Photosynthetic cyanobacteria (phototrophic metabolism)
  4.    None of the above
 Discuss Question
Answer: Option A. -> Aerobic, glucose-respiring bacteria (aerobic respiration)
Question 109. . An organism is completely dependent on atmospheric O2 for growth. This organism is
  1.    osmotolerant
  2.    acidophile
  3.    facultative anaerobe
  4.    obligate aerobe
 Discuss Question
Answer: Option D. -> obligate aerobe
Question 110. . The term aerotolerant anaerobe refers to an organism that
  1.    doesn't use oxygen but can grow in the presence of oxygen
  2.    is killed by oxygen
  3.    requires less oxygen than is present in air
  4.    prefers to grow without oxygen
 Discuss Question
Answer: Option A. -> doesn't use oxygen but can grow in the presence of oxygen

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