Microbiology Exam v3 Verified Grades already passed A+

Microbiology Exam 3 Verified Grades v v v v




already passed,A+ v v




E - CORRECT ANSWER✔✔Microorganisms that "mineralize" organic compounds (select the essence of
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mineralization, not from Wikipedia)
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A. render them less toxic.
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B. degrade them to minerals such as the salts of calcium, magnesium and potassium.
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C. reduce them to methane.
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D. render them water-soluble.
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E. oxidize them to CO2.
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A - CORRECT ANSWER✔✔Which of the below is notorious in Florida and elsewhere as the cause of necrotic
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skin- and flesh-lesions?
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A. Vibrio vulnificus v v




B. V. badassificus v v




C. V. fischeri v v v




D. V. cholerae v v v




E. V. parahemolyticus
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B - CORRECT ANSWER✔✔Which causes a true "food poisoning," i.e., elaborates a toxin outside of the host
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body in contrast to infecting the host gut and causing a gastroenteritis, though often mediated by toxins.
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A. Clostridium botulinumv v v

,B. Staphylococcus aureus
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C. A and B v v v




D. Salmonella typhi v v




E. Vibrio cholerae
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D - CORRECT ANSWER✔✔What term describes microbially mediated anaerobic oxidation of ammonia?
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A. methanogenesis v v




B. diazotrophy v




C. anamox v




D. nitrification v




E. autotrophy
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A - CORRECT ANSWER✔✔A vaccine that protects against diphtheria, pertussis and tetanus (DPT) addresses
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etiological agents with which of the respective gram reactions.
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A. +/-/+ v




B. -/-/+ v v




C. +/+/- v




D. -/+/- v v




E. +/+/+ v




B - CORRECT ANSWER✔✔The above referenced DPT vaccine protects against bacterial diseases, the
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etiological agents of which are currently assigned to which respective bacterial phyla (Phylum level)?
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A. Actinobacteria/ Firmicutes/ Proteobacteria
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B. Actinobacteria/ Proteobacteria/ Firmicutes
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C. Actinobacteria/ Firmicutes/ Archaea
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D. Actinobacteria/ Proteobacteria/ Fungi
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,E. Proteobacteria/ Firmicutes / Protozoa
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E - CORRECT ANSWER✔✔Which is/are characteristic of members of the Pseudomonas spp.?
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A. respiratory metabolism, usually use molecular oxygen as terminal electron acceptor.
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B. fluorescent soluble pigments released into media
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C. Entner-Doudoroff glycolytic pathway
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D. gram-negative, non-spore formers with polar flagella
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E. All of the above
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A - CORRECT ANSWER✔✔What term describes bacteria that can use 1-C organic molecules as a carbon
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source?
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A. Methylotroph v




B. Methanogen v




C. Diazotroph v




D. Autotroph v




E. auxotrophv




E - CORRECT ANSWER✔✔Known and laboratory culturable members of Domain Archaea
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A. all have prokaryotic cells.
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B. are often obligate anaerobes.
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C. are rare, relative to members of Domains Eukarya and Bacteria.
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D. are often thermophiles and acidophiles.
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E. are all of the above.
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E - CORRECT ANSWER✔✔Serratia marcesans:
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A. red pigment prodigiosin
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, B. used by U.S. military to assess aerial dispersion of bioterrorism agent
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C. Phylum Proteobacteria, Class Gammaprotoeobacteria
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D. microbiology teaching laboratory demonstrating epidemics
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E. all of the above
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E - CORRECT ANSWER✔✔Bradyrhizobium japonicum
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A. forms a nitrogen-fixing symbiosis with soybeans.
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B. may grow chemolithotrophically as well as heterotrophically.
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C. is a slow-growing member of Rhizobiaceae.
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D. synthesizes the heme component of a leghemoglobin.
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E. does all of the above.
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E - CORRECT ANSWER✔✔Members of the genus Clostridium
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A. may produce exotoxins as a primary virulence factor.
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B. produce terminal bulging endospores that make cells look like squash (tennis) racquets.
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C. are in Phylum Firmicutes.
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D. are obligate anaerobic gram positive rods.
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E. are all of the above
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E - CORRECT ANSWER✔✔The moles-percent base composition of a DNA molecule may be estimated by
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A. quantification of any one of the four bases.
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B. determining Tm (melting temperature) for the DNA.
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C. measuring the length of the DNA by electron microscopy.
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D. asking a taxi driver.
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E. all except D.
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