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MCQs

Total Questions : 137 | Page 2 of 14 pages
Question 11. For most bacteria, the optimum pH for growth lies between
  1.    6.5-7.5
  2.    3.5-4.5
  3.    4.5-5.5
  4.    5.5-6.5
 Discuss Question
Answer: Option A. -> 6.5-7.5
Answer: (a).6.5-7.5
Question 12. Which of the following is an abiotic elicitors?
  1.    UV irradiation
  2.    Osmotic shock
  3.    Heavy metal ions
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 13. Suspension cultures consist of cells and cell aggregates, growing dispersed in
  1.    liquid medium
  2.    solid nutrient medium
  3.    solid or liquid medium
  4.    none of these
 Discuss Question
Answer: Option A. -> liquid medium
Answer: (a).liquid medium
Question 14. Thiobacillus thiooxidans has an optimum pH of
  1.    2.0-3.5
  2.    0.5-6.0
  3.    6.5-7.5
  4.    9.0-9.5
 Discuss Question
Answer: Option A. -> 2.0-3.5
Answer: (a).2.0-3.5
Question 15. Balanced growth is defined as
  1.    cultures undergoing balanced growth while maintaining a constant chemical composition
  2.    balancing the growth while controlling the pH
  3.    balancing the growth while controlling the temperature
  4.    balancing the growth while changing the nutrient composition
 Discuss Question
Answer: Option A. -> cultures undergoing balanced growth while maintaining a constant chemical composition
Answer: (a).cultures undergoing balanced growth while maintaining a constant chemical composition
Question 16. Stringent anaerobes can be grown in a media by taking special measure as
  1.    boiling the media for several minutes
  2.    addition of cysteine
  3.    passing through oxygen-free nitrogen
  4.    any of these
 Discuss Question
Answer: Option D. -> any of these
Answer: (d).any of these
Question 17. Radical shifts in pH can be prevented by incorporating
  1.    a buffer
  2.    an oxidizing agent
  3.    a reducing agent
  4.    any of these
 Discuss Question
Answer: Option A. -> a buffer
Answer: (a).a buffer
Question 18. Isolation of pure culture refers to ___________
  1.    purification of culture
  2.    introduction of inoculum
  3.    separation of a single colony
  4.    to grow microorganisms on a surface
 Discuss Question
Answer: Option C. -> separation of a single colony
Answer: (c).separation of a single colony
Question 19. Vibrio cholerae can grow in a medium with a pH of _______
  1.    5.5
  2.    7.0
  3.    8.5
  4.    2.0
 Discuss Question
Answer: Option C. -> 8.5
Answer: (c).8.5
Question 20. Enrichment media allows the growth of a large number of varied bacterial species.
  1.    True
  2.    Flase
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option C. -> May be
Answer: False

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