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MCQs

Total Questions : 186 | Page 6 of 19 pages
Question 51. Cellulose is degraded to cellobiose by the enzyme __________________
  1.    cellulase
  2.    beta-glucosidase
  3.    hexokinase
  4.    cellulose dehydrogenase
 Discuss Question
Answer: Option A. -> cellulase
Answer: (a).cellulase
Question 52. In carbon cycle flow of energy is _________________
  1.    bidirectional
  2.    linear
  3.    cyclic
  4.    irreversible
 Discuss Question
Answer: Option B. -> linear
Answer: (b).linear
Question 53. The amount of organic material in the forest soil remains approximately the same from year to year.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 54. Fresh air contains approximately ______ percent carbon dioxide by volume.
  1.    0.01
  2.    2
  3.    5
  4.    0.03
 Discuss Question
Answer: Option D. -> 0.03
Answer: (d).0.03
Question 55. Cellobiose is metabolized directly by many microorganisms.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 56. Sulphates are reduced to hydrogen sulphide by _____________________
  1.    Desulfotomaculum sp.
  2.    Thiobacillus thiooxidans
  3.    Photosynthetic sulfur bacteria
  4.    Rhodospirillum
 Discuss Question
Answer: Option A. -> Desulfotomaculum sp.
Answer: (a).Desulfotomaculum sp.
Question 57. The Winogradsky column experiment is done in the dark.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 58. The reduction of sulphates and sulphites to hydrogen sulphide is done by which group of bacteria?
  1.    aerobic sulfate-reducing bacteria
  2.    photosynthetic sulphur bacteria
  3.    anaerobic sulphate-reducing bacteria
  4.    heterotrophic bacteria
 Discuss Question
Answer: Option C. -> anaerobic sulphate-reducing bacteria
Answer: (c).anaerobic sulphate-reducing bacteria
Question 59. Which of the following processes is performed by Thiobacillus thiooxidans?
  1.    converting sulphur to sulphates
  2.    converting sulphur to sulphides
  3.    converting sulphur to sulphites
  4.    converting organic sulphur to inorganic sulphur
 Discuss Question
Answer: Option A. -> converting sulphur to sulphates
Answer: (a).converting sulphur to sulphates
Question 60. Cysteine breaks down in presence of cysteine desulfurase to give _________________
  1.    oxaloacetic acid
  2.    sulphuric acid
  3.    pyruvic acid
  4.    glyoxalate
 Discuss Question
Answer: Option C. -> pyruvic acid
Answer: (c).pyruvic acid

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