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MCQs

Total Questions : 186 | Page 16 of 19 pages
Question 151. Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?
  1.    Both (a) and (b)
  2.    Rhodomicrobium
  3.    Chlorobium
  4.    Chromaticum
 Discuss Question
Answer: Option A. -> Both (a) and (b)
Question 152. The phenomenon of commensalism refers to a relationship between organisms in which
  1.    one species of a pair benefits
  2.    one species of a pair is more benefited
  3.    both the species of a pair benefit
  4.    None of these
 Discuss Question
Answer: Option A. -> one species of a pair benefits
Question 153. The population of algae in soil is __________ that of either bacteria or fungi.
  1.    none of these
  2.    generally smaller than
  3.    generally greater than
  4.    equal to
 Discuss Question
Answer: Option B. -> generally smaller than
Question 154. The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
  1.    nitrification
  2.    denitrification
  3.    ammonification
  4.    nitrogen fixation
 Discuss Question
Answer: Option B. -> denitrification
Question 155. The groups of symbiotic bacteria, which have the ability to fix nitrogen
  1.    these bacteria are from the genus, Rhizobium
  2.    All of these
  3.    derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
  4.    grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
 Discuss Question
Answer: Option B. -> All of these
Question 156. Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
  1.    ammonia
  2.    nitrate
  3.    ATP
  4.    glucose
 Discuss Question
Answer: Option A. -> ammonia
Question 157. A heterocyst is
  1.    a type of spore
  2.    a cell that carries out oxygenic photosynthesis
  3.    the progenitor of cyanobacterial vegetative cells
  4.    a terminally differentiated cell that fixes nitrogen
 Discuss Question
Answer: Option D. -> a terminally differentiated cell that fixes nitrogen
Question 158. The diagnostic enzyme for denitrification is
  1.    nitrate oxidase
  2.    nitro oxidoreductase
  3.    none of these
  4.    nitrate reductase
 Discuss Question
Answer: Option D. -> nitrate reductase
Question 159. An example of a symbiotic nitrogen fixer is
  1.    Beijerinckia
  2.    Rhizobium
  3.    Clostridium
  4.    Azotobacter
 Discuss Question
Answer: Option B. -> Rhizobium
Question 160. Nitrogen oxidation (nitrification)refers to the
  1.    sulfur is oxidized to the sulfate form through Thiobacillus bacteria
  2.    conversion of ammonium ions into nitrates through the activities of certain bacteria.
  3.    None of these
  4.    changing of atmospheric nitrogen (N2) to nitrogen compounds
 Discuss Question
Answer: Option B. -> conversion of ammonium ions into nitrates through the activities of certain bacteria.

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