Question 1

Which of the following statements does NOT apply to magnetotactic bacteria?

Accepted Answer

A)  The bacteria align their long axis at right angles to the lines of the magnetic fields. 
B)  The cells contain particles of Fe3O4. 
C)  Magnetic orientation may provide a means for maintaining the organisms in low oxygen levels. 
D)  In cells from the Northern Hemisphere, magnetosomes align themselves forward with respect to the flagella and move north. 
A)  The bacteria align their long axis at right angles to the lines of the magnetic fields. 
B)  The cells contain particles of Fe3O4. 
C)  Magnetic orientation may provide a means for maintaining the organisms in low oxygen levels. 
D)  In cells from the Northern Hemisphere, magnetosomes align themselves forward with respect to the flagella and move north.

Question 2

Although the nitrogen- fixing bacterium Azotobacter is an obligate aerobe, the enzyme nitrogenase is oxygen- sensitive. Explain how this enzyme functions in an aerobic atmosphere.

Accepted Answer

Azotobacter can grow in the presence of

Question 3

Which of the following is NOT a characteristic of myxobacteria?

Accepted Answer

A)  The organisms may be readily isolated from soil or dead organic matter on nutrient- rich agar. 
B)  Vegetative cells are gram- negative. 
C)  The mounding of cells after aggregation leads to fruiting body formation. 
D)  Myxospores are more resistant to heating and drying than is the vegetative cell. 
A)  The organisms may be readily isolated from soil or dead organic matter on nutrient- rich agar. 
B)  Vegetative cells are gram- negative. 
C)  The mounding of cells after aggregation leads to fruiting body formation. 
D)  Myxospores are more resistant to heating and drying than is the vegetative cell.

Question 4

Two broad ecological classes of sulfur- oxidizing bacteria exist: those living at _________ and those living at________ .

Accepted Answer

neutral pH

Question 5

Because of the rapid motility of Proteus cells, colonies growing on agar plates often exhibit a characteristic ________phenotype.

Accepted Answer

The answer of Because of the rapid motility of Proteus...

Question 6

Which of the following traits is NOT characteristic of Caulobacter?

Accepted Answer

A)  forms rosettes due to the attached stalks of several cells 
B)  attaches to surfaces in nature 
C)  abundant in aquatic habitats rich in nutrients 
D)  produces a cytoplasmic outgrowth (prostheca) 
A)  forms rosettes due to the attached stalks of several cells 
B)  attaches to surfaces in nature 
C)  abundant in aquatic habitats rich in nutrients 
D)  produces a cytoplasmic outgrowth (prostheca)

Question 7

Sheathed bacteria are commonly isolated from

Accepted Answer

A)  freshwater habitats that are rich in organic matter. 
B)  marine or brackish habitats. 
C)  human intestinal tracts. 
D)  fertile soils. 
A)  freshwater habitats that are rich in organic matter. 
B)  marine or brackish habitats. 
C)  human intestinal tracts. 
D)  fertile soils.

Question 8

Some species of luminous bacteria colonize specialized organs of certain marine fishes and squids and produce light that the animal uses for signaling, avoiding predators, and attracting prey.

Accepted Answer

A) True 
 B)False

Question 9

Members of the genus Vibrio are typically isolated from the mammalian intestinal tract.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following would NOT aid in the enrichment of sulfate reducers?

Accepted Answer

A)  ascorbate or thioglycolate 
B)  incubation under aerobic conditions 
C)  ferrous iron 
D)  lactate- sulfate medium 
A)  ascorbate or thioglycolate 
B)  incubation under aerobic conditions 
C)  ferrous iron 
D)  lactate- sulfate medium

Exam 17: Bacteria: the Proteobacteria

Which of the following statements does NOT apply to magnetotactic bacteria?

Although the nitrogen- fixing bacterium Azotobacter is an obligate aerobe, the enzyme nitrogenase is oxygen- sensitive. Explain how this enzyme functions in an aerobic atmosphere.

Which of the following is NOT a characteristic of myxobacteria?

Two broad ecological classes of sulfur- oxidizing bacteria exist: those living at _________ and those living at________ .

Because of the rapid motility of Proteus cells, colonies growing on agar plates often exhibit a characteristic ________phenotype.

Which of the following traits is NOT characteristic of Caulobacter?

Sheathed bacteria are commonly isolated from

Some species of luminous bacteria colonize specialized organs of certain marine fishes and squids and produce light that the animal uses for signaling, avoiding predators, and attracting prey.

Members of the genus Vibrio are typically isolated from the mammalian intestinal tract.

Which of the following would NOT aid in the enrichment of sulfate reducers?

Microorganisms and Microbiology

A Brief Journey to the Microbial World

Cell Structure and Function in Bacteria and Archaea

Nutrition, Culture, and Metabolism of Microorganisms

Microbial Growth

Molecular Biology of Bacteria

Archael and Eukaryotic Molecular Biology

Regulation of Gene Expression

Viruses and Virology

Genetics of Bacteria and Arachaea

Genetic Engineering

Microbial Genomics

Phototrophy, Chemolithotrophy, and Major Biosyntheses

Catabolism of Organic Compounds

Commercial Products and Biotechnology

Microbial Evolution and Systematics

Other Bacteria

Archaea

Eukaryotic Cell Biology and Eukaryotic Microorganisms

Viral Diversity

Methods in Microbial Ecology

Major Microbial Habitats and Diversity

Nutrient Cycles, Biodegradation, and Bioremediation

Microbial Symbioses

Microbial Growth Control

Microbial Interactions With Humans

Immunity and Host Defense

Immune Mechanisms

Molecular Immunology

Diagnostic Microbiology and Immunology

Epidemiology

Person-To-Person Microbial Diseases

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Wastewater Treatment, Water Purification, and Waterborne Microbial Diseases

Food Preservation and Foodborne Microbial Diseases

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Two broad ecological classes of sulfur- oxidizing bacteria exist: those living at _ and those living at .