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1) Which of the following are found primarily in the intestines of humans?
A) Gram-negative aerobic rods and cocci
B) Aerobic, helical bacteria
C) Facultatively anaerobic gram-negative rods
D) Gram-positive cocci
E) None of the above
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C) Facultatively anaerobic gram-negative rods
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2) Which of the following is a characteristic of Clostridium?
A) Endospore-forming cocci
B) Mycobacteria
C) Gram-negative aerobic cocci
D) Anaerobic gram-negative rods
E) None of the above
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A) Endospore-forming cocci
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3) Which of the following is not a characteristic of the regular, nonsporing gram-positive rods?
A) Aerotolerant
B) Fermentative metabolism
C) Donʹt produce endospores
D) Nonpathogenic
E) None of the above
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D) Nonpathogenic
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4) Which of the following is not a characteristic of Neisseria?
A) Requires X and V factors
B) Cocci
C) Gram-negative
D) Oxidase-positive
E) None of the above
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A) Requires X and V factors
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5) Staphylococcus and Streptococcus can be easily differentiated in a laboratory by which one of the
following?
A) Cell shape
B) Gram stain reaction
C) Growth in high salt concentrations
D) Ability to cause disease
E) None of the above
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C) Growth in high salt concentrations
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6) Which of the following genera is an anaerobic gram-negative rod?
A) Escherichia
B) Staphylococcus
C) Bacteroides
D) Treponema
E) None of the above
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C) Bacteroides
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7) Which of the following do you expect to be most resistant to high temperatures?
A) Bacillus subtilis
B) Eschericia coli
C) Neisseria gonorrhoeae
D) Staphylococcus aureus
E) Streptococcocus pyogenes
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A) Bacillus subtilis
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8) Which of the following is not an enteric?
A) Salmonella
B) Shigella
C) Escherichia
D) Enterobacter
E) Campylobacter
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E) Campylobacter
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9) Which of the following is not a characteristic of spirochetes?
A) Possess an axial filament
B) Gram-negative
C) Helical shape
D) Easily observed with brightfield microscopy
E) Difficult to culture in vitro
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D) Easily observed with brightfield microscopy
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10) You have isolated a bacterium that grows in a medium containing an organic substrate and
nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. This bacterium is
A) Gram-negative.
B) Using anaerobic respiration.
C) A chemoautotroph.
D) A photoautotroph.
E) A photoheterotroph.
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B) Using anaerobic respiration.
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11) Which of the following lacks a cell wall?
A) Borrelia
B) Mycoplasma
C) Mycobacterium
D) Clostridium
E) Nocardia
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B) Mycoplasma
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12) Which of the following is not gram-positive?
A) Treponema
B) Corynebacterium
C) Bacillus
D) Staphylococcus
E) Mycobacterium
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A) Treponema
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13) Which of the following form conidiospores?
A) Endospore-forming gram-positive rods and cocci
B) Actinomycetes and related organisms
C) Rickettsias
D) Anaerobic gram-negative cocci
E) Spiral and curved bacteria
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B) Actinomycetes and related organisms
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14) Which of the following pairs is mismatched?
A) Dissimilatory sulfate-reducing bacteria produce H2S
B) Archaea live in extreme environments
C) Chemoautotrophic bacteria fix atmospheric nitrogen
D) Actinomycetes reproduce by fragmentation
E) Cytophaga a gliding, nonfruiting bacterium
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C) Chemoautotrophic bacteria fix atmospheric nitrogen
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15) Rickettsias differ from chlamydias in that rickettsias
A) Are gram-negative.
B) Are intracellular parasites.
C) Require an arthropod for transmission.
D) Form elementary bodies.
E) None of the above.
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C) Require an arthropod for transmission.
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6) Requirements for X and V factors are used to identify
A) Staphylococcus.
B) Escherichia.
C) Neisseria.
D) Haemophilus.
E) None of the above.
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D) Haemophilus.
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17) You have isolated a bacterium that grows in a medium containing only inorganic nutrients.
Ammonia is oxidized to nitrate ion. This bacterium is
A) Gram-negative.
B) Using anaerobic respiration.
C) A chemoautotroph.
D) A photoautotroph
E) A photoheterotroph.
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C) A chemoautotroph.
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18) Which of the following is not gram-negative?
A) Pseudomonas
B) Salmonella
C) Streptococcus
D) Bacteroides
E) Rickettsia
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C) Streptococcus
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19) Escherichia coli belongs to the
A) Proteobacteria.
B) Gram-positive bacteria.
C) Green sulfur bacteria.
D) Spirochetes.
E) Actinomycetes.
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A) Proteobacteria.
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20) Which one of the following does not belong with the others?
A) Bacillus
B) Escherichia
C) Lactobacillus
D) Staphylococcus
E) Streptococcus
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B) Escherichia
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21) All of the following are true about the causative agent of Rocky Mountain spotted fever except
A) It is an intracellular parasite.
B) It is transmitted by ticks.
C) It is in the genus Rickettsia.
D) It is gram-negative.
E) It is found in soil and water.
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E) It is found in soil and water.
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22) A primary difference between cyanobacteria and purple and green phototrophic bacteria is
A) Energy source.
B) Cell wall type.
C) Electron donor for CO 2 reduction.
D) Cell type.
E) Color.
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B) Cell wall type.
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23) Which one of the following does not belong with the others?
A) Bordetella
B) Burkholderia
C) Campylobacter
D) Pseudomonas
E) Salmonella
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E) Salmonella
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24) The bacteria responsible for more infections and more different kinds of infections are
A) Streptococcus.
B) Staphylococcus.
C) Salmonella.
D) Pseudomonas.
E) Neisseria.
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A) Streptococcus.
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25) Both Beggiatoa and the purple sulfur bacteria use H 2S. These bacteria differ because Beggiatoa
A) Uses H 2S for an energy source.
B) Uses H 2S for a carbon source.
C) Uses light energy.
D) Belongs to the gammaproteobacteria
E) Is a heterotroph.
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A) Uses H 2S for an energy source.
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26) The nonsulfur photosynthetic bacteria use organic compounds as
A) Carbon sources.
B) Electron donors to reduce CO 2.
C) Energy sources.
D) Electron acceptors.
E) All of the above.
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B) Electron donors to reduce CO 2.
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27) Which of the following is the best reason to classify Streptococcus in the Lactobacillales?
A) Gram reaction
B) Morphology
C) Fermentation of lactose
D) rRNA sequences
E) All of the above.
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D) rRNA sequences
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28) Streptomyces differs from Actinomyces because Streptomyces
A) Makes antibiotics.
B) Produces conidia.
C) Forms filaments.
D) Is aerobic.
E) None of the above.
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D) Is aerobic.
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29) All of the following are gram-positive. Which does not belong with the others?
A) Actinomyces
B) Bacillus
C) Corynebacterium
D) Listeria
E) Mycobacterium
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E) Mycobacterium
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30) Salmonella, Shigella, Yersinia, and Serratia are all
A) Pathogens.
B) Gram-negative facultatively anaerobic rods.
C) Gram-positive aerobic cocci.
D) Fermentative.
E) None of the above.
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B) Gram-negative facultatively anaerobic rods.
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31) You have isolated a gram-positive rod. What should you do next?
A) Gram stain
B) Lactose fermentation
C) Endospore stain
D) Flagella stain
E) Enterotube
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C) Endospore stain
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32) Borrelia is classified as a spirochete because it
A) Is aerobic.
B) Possesses an axial filament.
C) Is a rod.
D) Is a pathogen.
E) None of the above.
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B) Possesses an axial filament.
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33) Thiobacillus oxidizes inorganic sulfur compounds and reduces CO 2. This bacterium is
A) A chemoheterotroph
B) A chemoautotroph
C) A photoautotroph
D) A γ-proteobacteria
E) None of the above.
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B) A chemoautotroph
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34) You have isolated a prokaryotic cell. The first step in identification is a(n)
A) Gram stain.
B) Lactose fermentation test.
C) Endospore stain.
D) Flagella stain.
E) DNA fingerprint.
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A) Gram stain.
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35) Actinomycetes differ from fungi because actinomycetes
A) Are chemoheterotrophs.
B) Lack a membrane-bounded nucleus.
C) Require light.
D) Are decomposers.
E) Cause disease.
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B) Lack a membrane-bounded
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36) You have isolated an aerobic gram-positive, endospore-forming bacterium that grows wells
on nutrient agar. To which of the following groups does it most likely belong?
A) Phototrphic bacteria
B) Gammaproteobacteria
C) Deltaproteobacteria
D) Bacillales
E) Canʹt tell
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D) Bacillales
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37) Which of the following pairs is mismatched?
A) Spirochete axial filament
B) Aerobic, helical bacteria gram-negative
C) Enterics gram-negative
D) Mycobacteria acid-fast
E) None of the above
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C) Enterics gram-negative
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38) Which one of the following does not belong with the others?
A) Coxiella
B) Ehrlichia
C) Rickettsia
D) Staphylococcus
E) None of the above
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D) Staphylococcus
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39) Caulobacter are different from most bacteria because
A) They are gram-negative.
B) They are gram-positive.
C) They have stalks.
D) They lack cell walls.
E) None of the above.
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C) They have stalks.
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40) Pathogenic bacteria are easily identified because they
A) Are motile.
B) Are gram-negative.
C) Produce endospores.
D) Grow at 37°C.
E) None of the above.
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E) None of the above.
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41) Which of the following does not belong with the others?
A) Halobacterium
B) Halococcus
C) Methanobacterium
D) Staphylococcus
E) Sulfolobus
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D) Staphylococcus
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42) What should you do if you suspect a patient has tuberculosis?
A) A Gram stain.
B) An acid-fast stain.
C) Check for motility.
D) Look at a wet mount.
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B) An acid-fast stain.
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43) All of the following are motile; which does not have flagella?
A) Enterics
B) Helical bacteria
C) Pseudomonas
D) Spirochetes
E) None of the above
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D) Spirochetes
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44) Mycoplasmas differ from other bacteria because they
A) Grow inside host cells.
B) Lack a cell wall.
C) Are acid-fast.
D) Are motile.
E) None of the above.
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B) Lack a cell wall.
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45) Which of the following pairs is not correctly matched?
A) Elementary body Escherichia
B) Endospore Bacillus
C) Endospore Clostridium
D) Heterocyst cyanobacteria
E) Myxospore gliding bacteria
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A) Elementary body Escherichia
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