©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 15
Exam Questions With Correct Answers
Which phylum harbors the MOST functional diversity observed and also has the MOST cultured
representatives? - answer✔Proteobacteria
Isolating a bacterium of the ________ class would be of high impact due to it only having one
cultured representative. - answer✔Zetaproteobacteria
A pink-pigmented facultative methylotrophic bacterium is LEAST likely to be a classified as a
member of - answer✔Rhodobacter
Which genus would you MOST likely find in the photic layer of the oceans due to its abundance
and aerobic chemoorganotroph phenotype? - answer✔Pelagibacter
Which of the following traits is NOT characteristic of Caulobacter? - answer✔abundant in
aquatic habitats rich in nutrients
Treating wastewater requires the removal of organic material, and an ideal phenotype of a
bacterium to do this would flocculate to make the cells settle (rather than staying in suspension)
in a wastewater stream. Which species would be best for this application? - answer✔Zoogloea
ramigera
While not all members of ________ are pathogenic, two medically relevant species cause
meningitis and gonorrhea in humans. - answer✔Neisseria
Chemolithotrophic ammonia-oxidization is a metabolic requirement for members of -
answer✔Nitrosomonas and Nitrosospira.
Biosynthesis of vitamin K (menaquinone) by ________ spp. inhabiting the ________ of humans
is a potentially important mutualistic relationship for human health. - answer✔Escherichia /
intestinal tract
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
A gram-negative, polarly flagellated, aerobic bacillus-shaped bacterium that can degrade a large
variety or aromatic compounds is likely a(n) - answer✔sphingomonad.
Which characteristic is NOT associated with Vibrio spp.? - answer✔gliding motility
A pseudomonad that loses its R plasmid in the soil is LEAST likely to - answer✔survive a
habitat dominated by antibiotic-producing Streptomyces spp.
Which of the following is NOT a member of the Deltaproteobacteria? - answer✔Campylobacter
Which of the following is NOT a trait of rickettsias? - answer✔They lack cell walls.
Which relationship is MOST likely to be observed between species of different classes? -
answer✔An epsilonbacterium oxidizes the hydrogen sulfide produced by a sulfur-reducing
deltaproteobacterium.
A bacterium with which metabolism is MOST likely to form a relationship with Syntrophobacter
wolinii? - answer✔molecular hydrogen oxidation
Based on oxygen requirements and metabolic strategies, isolating an epsilonproteobacterium
from ________ would likely be MOST fruitful. - answer✔sulfate-rich anoxic-oxic interfaces
Which of the following is NOT true of Epsilonproteobacteria? - answer✔Epsilonproteobacteria
are prolific metal reducers.
Which taxon is NOT gram-positive? - answer✔Sphingobacteria
Which feature(s) differentiate(s) Actinobacteria from Firmicutes? - answer✔relative G+C
content in their genomes
The order Lactobacillales within Firmicutes are also called the lactic acid bacteria, because these
bacteria - answer✔produce lactate.
What would MOST likely result if an exponentially growing culture of Lactobacillus sp.
fermenting glucose was accidentally transferred into a highly aerated environment? -
answer✔Fermentation of glucose would continue, because the cells are insensitive to O2 despite
lacking aerobic metabolism capabilities.
Which bacterial genus would be best to select for fermenting cabbage to make homemade
sauerkraut? - answer✔Lactobacillus
Which phenotypic assay could be used to determine whether a new Streptococcus sp. is of the
pyogenes or viridans group? - answer✔occurrence of cells being in clusters or as individual cells
under a microscope
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 15
Exam Questions With Correct Answers
Which phylum harbors the MOST functional diversity observed and also has the MOST cultured
representatives? - answer✔Proteobacteria
Isolating a bacterium of the ________ class would be of high impact due to it only having one
cultured representative. - answer✔Zetaproteobacteria
A pink-pigmented facultative methylotrophic bacterium is LEAST likely to be a classified as a
member of - answer✔Rhodobacter
Which genus would you MOST likely find in the photic layer of the oceans due to its abundance
and aerobic chemoorganotroph phenotype? - answer✔Pelagibacter
Which of the following traits is NOT characteristic of Caulobacter? - answer✔abundant in
aquatic habitats rich in nutrients
Treating wastewater requires the removal of organic material, and an ideal phenotype of a
bacterium to do this would flocculate to make the cells settle (rather than staying in suspension)
in a wastewater stream. Which species would be best for this application? - answer✔Zoogloea
ramigera
While not all members of ________ are pathogenic, two medically relevant species cause
meningitis and gonorrhea in humans. - answer✔Neisseria
Chemolithotrophic ammonia-oxidization is a metabolic requirement for members of -
answer✔Nitrosomonas and Nitrosospira.
Biosynthesis of vitamin K (menaquinone) by ________ spp. inhabiting the ________ of humans
is a potentially important mutualistic relationship for human health. - answer✔Escherichia /
intestinal tract
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
A gram-negative, polarly flagellated, aerobic bacillus-shaped bacterium that can degrade a large
variety or aromatic compounds is likely a(n) - answer✔sphingomonad.
Which characteristic is NOT associated with Vibrio spp.? - answer✔gliding motility
A pseudomonad that loses its R plasmid in the soil is LEAST likely to - answer✔survive a
habitat dominated by antibiotic-producing Streptomyces spp.
Which of the following is NOT a member of the Deltaproteobacteria? - answer✔Campylobacter
Which of the following is NOT a trait of rickettsias? - answer✔They lack cell walls.
Which relationship is MOST likely to be observed between species of different classes? -
answer✔An epsilonbacterium oxidizes the hydrogen sulfide produced by a sulfur-reducing
deltaproteobacterium.
A bacterium with which metabolism is MOST likely to form a relationship with Syntrophobacter
wolinii? - answer✔molecular hydrogen oxidation
Based on oxygen requirements and metabolic strategies, isolating an epsilonproteobacterium
from ________ would likely be MOST fruitful. - answer✔sulfate-rich anoxic-oxic interfaces
Which of the following is NOT true of Epsilonproteobacteria? - answer✔Epsilonproteobacteria
are prolific metal reducers.
Which taxon is NOT gram-positive? - answer✔Sphingobacteria
Which feature(s) differentiate(s) Actinobacteria from Firmicutes? - answer✔relative G+C
content in their genomes
The order Lactobacillales within Firmicutes are also called the lactic acid bacteria, because these
bacteria - answer✔produce lactate.
What would MOST likely result if an exponentially growing culture of Lactobacillus sp.
fermenting glucose was accidentally transferred into a highly aerated environment? -
answer✔Fermentation of glucose would continue, because the cells are insensitive to O2 despite
lacking aerobic metabolism capabilities.
Which bacterial genus would be best to select for fermenting cabbage to make homemade
sauerkraut? - answer✔Lactobacillus
Which phenotypic assay could be used to determine whether a new Streptococcus sp. is of the
pyogenes or viridans group? - answer✔occurrence of cells being in clusters or as individual cells
under a microscope
