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MCQs

Total Questions : 119 | Page 8 of 12 pages
Question 71. . The straightforward method of binary fission explains how bacteria
  1.    grow in nutrient agar
  2.    evolve
  3.    move
  4.    reproduce
 Discuss Question
Answer: Option D. -> reproduce
Question 72. . The equation used to obtain bacterial population by binary fission is
  1.    N = No2n
  2.    log N/No = (0.3010) n
  3.    log(N/No) = nlog 2
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 73. . An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is
  1.    osmotolerant
  2.    acidophile
  3.    neutrophile
  4.    aerotolerant anaerobe
 Discuss Question
Answer: Option B. -> acidophile
Question 74. . Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media?
  1.    Coulter Counter
  2.    Hemostat
  3.    Petroff-Hausser chamber
  4.    Trubidostat
 Discuss Question
Answer: Option D. -> Trubidostat
Question 75. . Bacteria and fungi multiply best
  1.    below 16°C
  2.    between 16-38°C
  3.    above 38°C
  4.    none of these
 Discuss Question
Answer: Option B. -> between 16-38°C
Question 76. . Organisms, using organic compounds as electron donors are called
  1.    lithotrophs
  2.    phototrophs
  3.    chemotrophs
  4.    organotrophs
 Discuss Question
Answer: Option D. -> organotrophs
Question 77. . The reproduction by budding occur in
  1.    Rhodopseudomonas acidophila
  2.    Hyphomicrobium vulgare
  3.    Bacillus subtilis
  4.    Both (a) and (b)
 Discuss Question
Answer: Option D. -> Both (a) and (b)
Question 78. . Starvation proteins are produced by a culture during which of the following segments of the growth curve?
  1.    Lag phase
  2.    Exponential phase
  3.    Stationary phase
  4.    Death phase
 Discuss Question
Answer: Option C. -> Stationary phase
Question 79. . Which of the following has more tolerance for acidic pH (lower pH)?
  1.    Yeast and moulds
  2.    Bacteria
  3.    E. coli
  4.    None of these
 Discuss Question
Answer: Option A. -> Yeast and moulds
Question 80. . 
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example 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 C. -> quorum sensing

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