Multiple Choice Questions MCQ in Microbiology: Preparation Material One

1. Which of the following is a non pathogen
   a. Yersinia Pestis b. Cryptococcus neoformans c. Anabaena spp d. Salmonella typhi
2. Prokaryotes are distinguished from eukaryotes by their
   a. Phospholipid plasma membrane b. Cytoplasm with ribosomes c. Nucleoid instead of nucleus d. Membrane bound organelles

MCQ: Environmental Microbiology 2nd

1. The biological oxygen demand (BOD) would be most directly affected by the presence of which of the following pollutants?
   a. Heavy metals            b. Organic wastes         c. Salt (Sodium chloride)          
   d. Waste minerals from mining   e. Fertilizer runoff from farms
2. The microorganisms that is mainly used as an indicator of fecal pollution in water is:
   a. Escherichia coli         b. Clostridium tetani      c. Clostridium botilinum
   d. Cyanobacteria                      e. All of these can be used
3. The worst water borne disease in U.S. was caused by:
   a. Escherichia coli         b. Salmonella typhi        c. Cryptosporidium parvum      
   d. Clostridium botulinum           e. None of these
4. Which of the following microorganisms are not derived from human pollution but can be found in water supply systems and are considered “nuisance” organisms?
   a. Coliform bacteria      b. Rhizobium    c. Azotobacter              d. Thiobacillus
   e. Clostridium
5. Biological treatment of sewage by microorganisms (mainly decomposers) would most likely occur at which stage of waste water treatment?
   a. Primary         b. Secondary    c. Tertiary         d. Advanced     e. All of these
6. Which of the following waste water treatments is most likely to produce carcinogens as a byproduct?
   a. Chlorination              b. Ozonation     c. Ultraviolet light (UV) d. Sand filtration           e. Carbon filtration
7. In order to prevent eutrophication of receiving waters, tertiary treatment is used to remove:
   a. Sulfate and nitrate     b. Phosphate and sulfate           c. Pathogenic bacteria
   d. Nitrate and phosphate           e. Excess oxygen
8. A major disadvantage of bioremediation is:
   a. Long times may be required              b. It is more expensive than other treatments
   c. It can not be used to treat contamination with hydrocarbons
   d. It requires removing contaminated soil to a bioreactor
   e. It requires introducing new microorganisms into an environment
9. The enzyme nitrogenase would most likely be found in:
   a. Nitrifying bacteria      b. Denitrifying bacteria  c. Nitrogen fixing bacteria
   d. Nitrogenase bacteria e. All of these
10. Free- living bacteria that are found in soil and can fix nitrogen are members of the genus:
    a. Nitrobacter   b. Rhizobium    c. Thiobacillus               d. Azotobacter            
    e. Clostridium
11. The most common microbiological contaminant of air is:
    a. Spores from bacteria             b. Spores from molds   c. Fungal hyphae
    d. Gram- positive bacteria         e. Gram negative bacteria.

MCQ: Environmental Microbiology 1st

1. In an ecosystem, autotrophic organisms would be classified as:
   a. Producers     b. Consumers   c. Decomposers           d. Parasites
   e. None of these
2. In an ecosystem, microorganisms are likely to be:
   a. Consumers   b. Producers     c. Decomposers           d. Parasites
   e. All of these
3. What percentage of nitrogen fixed annually on earth is fixed by the action of bacteria?
   a. less than 10%           b. 20%             c. 50%             d. 70%             e. 90%
4. The microorganisms that are the primary symbiotic nitrogen fixers are members of the genus:
   a. Klebsiella      b. Azotobacter             c. Rhizobium                 d. Clostridium  
   e. None of these
5. The form of nitrogen that is most usable in plants is:
   a. Nitrate          b. Nitrite           c. Molecular Nitrogen               d. Ammonia     
   e. Ammonium ions
6. Which of the following forms of nitrogen can be use by microorganisms in place of molecular oxygen?
   a. Ammonium ions        b. Nitrate          c. Molecular nitrogen                d. Ammonia     
   e. None of these
7. Which form of sulfur is most usable by both microorganisms and plants?
   a. Sulfite           b. Hydrogen sulfide       c. Elemental sulfur         d. Sulfate         
   e. None of these
8. All sulfate reducing bacteria are classified as:
   a. Anaerobes    b. Psychrophilic            c. Mesophilic    d. Thermophilic
   e. Halophilic
9. Members of the genus Thiobacillus can produce sulfuric acid by the oxidation of:
   a. Hydrogen sulfide       b. Ferrous sulfide          c. Elemental sulfur         d. All of these
   e. None of these
10. The most numerous group of microorganisms found in soil are the:
    a. Fungi            b. algae            c. protists         d. bacteria        e. viruses
11. Soil microorganisms that are also potential pathogens for humans and other animals are most likely to be members of the genus:
    a. Thiobacillus               b. Rhizobium    c. Clostridium               d. Azotobacter
    e. All of these

Agriculture Microbiology MCQ tribhuvan University 8

71. siderophores are
a. high affinity iron chelating compound b. those which transport iron into bacterial cell c. none d. both
72. application of the ammonium containing fertilizers………..
a. suppress the bacterial community b. increases fungal population
c. both of the above d. none of the above
73. phyllospheric organisms does not take part in
a. mineralization b. fertilizer effect c. growth hormone production d. all
74. heterocysts are
a. specialized nitrogen fixing cells b. formed by cyanobacteria c. formed during nitrogen starvation d. all of the above
75. ….. soil is considered ideal for gardening and agricultural purposes.
a. loam soil b. clay soil c. sand soil d. silt soil
76. Azotobacter is
a. cyst forming bacteria b. does not produce spores c. strict aerobe
d. all of the above
77. diazotrophs are
a. organisms capable of nitrogen fixation b. organisms such as rhizobia, frankia, azospirillium c both of the above d. none of the above
78. which of the following horizon is dominant reservoir of Microbial food
a. A b. B c. C d. O
79. …………. Is also known as fat of the land.
a. clay soil b. Humus c. triglycerides d. lignin
80. Humus………….
a. consists of partially decomposed organic matter
b. dominant food reservoir
c. also called fat of the land
d. all of the above