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MCQs

Total Questions : 186 | Page 14 of 19 pages
Question 131. Which of the following are not the features of component II of nitrogenase enzyme complex?
  1.    component II is nitrogenase reductase
  2.    component II is known as the MoFe protein
  3.    contains sulfur
  4.    not active without component I
 Discuss Question
Answer: Option B. -> component II is known as the MoFe protein
Answer: (b).component II is known as the MoFe protein
Question 132. Which of the following is a symbiotic nitrogen fixing bacteria?
  1.    Rhizobium trifolii
  2.    Clostridium pasteurianum
  3.    Azotobacter sp.
  4.    Escherichia coli
 Discuss Question
Answer: Option A. -> Rhizobium trifolii
Answer: (a).Rhizobium trifolii
Question 133. Which among the following are the most important agents for carbon dioxide fixation?
  1.    bacteria
  2.    fungi
  3.    algae
  4.    protozoa
 Discuss Question
Answer: Option C. -> algae
Answer: (c).algae
Question 134. Which among the following develop in the upper portion of the Winogradsky column?
  1.    Sulfate-reducing bacteria
  2.    Green-sulfur bacteria
  3.    Purple-sulfur bacteria
  4.    Thiobacilli
 Discuss Question
Answer: Option D. -> Thiobacilli
Answer: (d).Thiobacilli
Question 135. Purple and green sulfur bacteria use ___________________ as the electron donor to reduce carbon dioxide.
  1.    S2-
  2.    SO42-
  3.    H2S
  4.    Organic acids
 Discuss Question
Answer: Option C. -> H2S
Answer: (c).H2S
Question 136. The moisture contained in clouds and precipitated as snow,hail,rain etc constitutes _________________
  1.    Atmospheric water
  2.    Surface water
  3.    Groundwater
  4.    Subterranean water
 Discuss Question
Answer: Option A. -> Atmospheric water
Answer: (a).Atmospheric water
Question 137. The surface waters are susceptible to contamination with microorganisms from _______________
  1.    the air
  2.    the surface runoff
  3.    precipitation
  4.    atmospheric water and the surface runoff
 Discuss Question
Answer: Option D. -> atmospheric water and the surface runoff
Answer: (d).atmospheric water and the surface runoff
Question 138. Which among the following is a non-sulfur purple bacteria?
  1.    Rhodomicrobium
  2.    Thiobacillus
  3.    Chromatium
  4.    Chlorobium
 Discuss Question
Answer: Option A. -> Rhodomicrobium
Answer: (a).Rhodomicrobium
Question 139. Which of the following is subterranean water?
  1.    Atmospheric water
  2.    Surface water
  3.    Groundwater
  4.    Rainwater
 Discuss Question
Answer: Option C. -> Groundwater
Answer: (c).Groundwater
Question 140. Wells less than ___________ deep are considered to be shallow.
  1.    1 ft
  2.    100 ft
  3.    50 ft
  4.    1000 ft
 Discuss Question
Answer: Option B. -> 100 ft
Answer: (b).100 ft

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