Question 1

Which of the following gliding bacteria form(s) fruiting bodies?

Accepted Answer

A)  Cytophaga 
B)  Myxococcus 
C)  Beggiatoa 
D)  all of the above 
A)  Cytophaga 
B)  Myxococcus 
C)  Beggiatoa 
D)  all of the above

Question 2

Methanotrophs

Accepted Answer

A)  have been found living in the gill tissues of marine mussels on the sea floor. 
B)  are widespread in nature. 
C)  are able to oxidize ammonia. 
D)  All of the above apply to the methanotrophs. 
A)  have been found living in the gill tissues of marine mussels on the sea floor. 
B)  are widespread in nature. 
C)  are able to oxidize ammonia. 
D)  All of the above apply to the methanotrophs.

Question 3

Explain why Thioploca plays a major role in sulfur and nitrogen cycling in the marine environment.

Accepted Answer

Thioploca have been observed to reduce n

Question 4

What is a major distinction between the hydrogen chemolithotrophs and many sulfur chemolithotrophs and the nitrifying bacteria?

Accepted Answer

A)  Hydrogen chemolithotrophs cannot be cultured in vitro, whereas the sulfur chemolithotrophs and nitrifying bacteria can easily be cultured. 
B)  Hydrogen chemolithotrophs are almost all facultative chemolithotrophs; the sulfur chemolithotrophs and nitrifying bacteria are nearly all obligate chemolithotrophs. 
C)  Hydrogen chemolithotrophs are found in dry environments, while sulfur chemolithotrophs and nitrifying bacteria are found in aquatic environments. 
D)  Hydrogen chemolithotrophs are anaerobes, whereas the sulfur chemolithotrophs and nitrifying bacteria are aerobes. 
A)  Hydrogen chemolithotrophs cannot be cultured in vitro, whereas the sulfur chemolithotrophs and nitrifying bacteria can easily be cultured. 
B)  Hydrogen chemolithotrophs are almost all facultative chemolithotrophs; the sulfur chemolithotrophs and nitrifying bacteria are nearly all obligate chemolithotrophs. 
C)  Hydrogen chemolithotrophs are found in dry environments, while sulfur chemolithotrophs and nitrifying bacteria are found in aquatic environments. 
D)  Hydrogen chemolithotrophs are anaerobes, whereas the sulfur chemolithotrophs and nitrifying bacteria are aerobes.

Question 5

No chemolithotroph is known to completely oxidize ammonia to nitrate.

Accepted Answer

A) True 
 B)False

Question 6

Experiments with Azotobacter chroococcum have led to the observation that

Accepted Answer

A)  nitrogenase reduces nitrogen to ammonia. 
B)  acetylene may be reduced by nitrogenase. 
C)  nitrogenase may contain molybdenum and iron. 
D)  two alternative nitrogenases can be made under certain growth conditions. 
A)  nitrogenase reduces nitrogen to ammonia. 
B)  acetylene may be reduced by nitrogenase. 
C)  nitrogenase may contain molybdenum and iron. 
D)  two alternative nitrogenases can be made under certain growth conditions.

Question 7

When a bacterium exhibits polar growth,

Accepted Answer

A)  cell division does not involve membrane complexes. 
B)  new cell wall material forms from a single point. 
C)  complex internal structures may be formed. 
D)  all of the above may occur. 
A)  cell division does not involve membrane complexes. 
B)  new cell wall material forms from a single point. 
C)  complex internal structures may be formed. 
D)  all of the above may occur.

Question 8

All nitrifying bacteria are obligate chemolithotrophs and obligate aerobes.

Accepted Answer

A) True 
 B)False

Question 9

Campylobacter and Helicobacter are two genera within the________ class of Proteobacteria.

Accepted Answer

A)  Delta 
B)  Epsilon 
C)  Alpha 
D)  Beta 
A)  Delta 
B)  Epsilon 
C)  Alpha 
D)  Beta

Question 10

Which of the following organisms does NOT produce prosthecae?

Accepted Answer

A)  Gallionella 
B)  Hyphomicrobium 
C)  Leptothrix 
D)  Caulobacter 
A)  Gallionella 
B)  Hyphomicrobium 
C)  Leptothrix 
D)  Caulobacter

Question 11

The most favorable lakes for the development of purple sulfur bacteria are those that are

Accepted Answer

A)  meromictic. 
B)  oligotrophic. 
C)  eutrophic. 
D)  sedimentary. 
A)  meromictic. 
B)  oligotrophic. 
C)  eutrophic. 
D)  sedimentary.

Question 12

Nitrifying bacteria develop particularly well in lakes and streams receiving sewage because of the ammonia (NH3) present in the sewage.

Accepted Answer

A) True 
 B)False

Question 13

Explain how the enteric bacteria can be differentiated by the type and proportion of fermentation products produced by the anaerobic fermentation of glucose.

Accepted Answer

While glucose is fermented by all enteri

Question 14

The epsilon proteobacterium Arcobacter nitrofigilis is often found in a parasitic relationship with the roots of the salt marsh cordgrass Spartina.

Accepted Answer

A) True 
 B)False

Question 15

Luminescence in bacteria is catalyzed by bacterial

Accepted Answer

A)  oxidases. 
B)  catalase. 
C)  luciferase. 
D)  hydrogenase. 
A)  oxidases. 
B)  catalase. 
C)  luciferase. 
D)  hydrogenase.

Question 16

The gram- positive bacteria are a large group of primarily chemoorganotrophic Bacteria.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following bacteria is the least phylogenetically related to Desulfovibrio?

Accepted Answer

A)  Desulfomonas 
B)  Desulfobulbus 
C)  Desulfotomaculum 
D)  Desulfobacter 
A)  Desulfomonas 
B)  Desulfobulbus 
C)  Desulfotomaculum 
D)  Desulfobacter

Question 18

The very large Spirillum volutans, which was observed by the earliest microscopists, is microaerophilic.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is NOT a trait of bioluminescent bacteria?

Accepted Answer

A)  They are luminescent only in the presence of oxygen. 
B)  Most inhabit soil environments. 
C)  Autoinduction of luminescence requires dense populations. 
D)  The enzyme luciferase and a long- chain aliphatic aldehyde are required for bioluminescence. 
A)  They are luminescent only in the presence of oxygen. 
B)  Most inhabit soil environments. 
C)  Autoinduction of luminescence requires dense populations. 
D)  The enzyme luciferase and a long- chain aliphatic aldehyde are required for bioluminescence.

Question 20

The oxidation of ammonia to nitrite is carried out by the ________bacteria. The product of this step is subsequently oxidized to nitrate by the _________ bacteria.

Accepted Answer

nitrosifyi

Exam 17: Bacteria: the Proteobacteria

Which of the following gliding bacteria form(s) fruiting bodies?

Methanotrophs

Explain why Thioploca plays a major role in sulfur and nitrogen cycling in the marine environment.

What is a major distinction between the hydrogen chemolithotrophs and many sulfur chemolithotrophs and the nitrifying bacteria?

No chemolithotroph is known to completely oxidize ammonia to nitrate.

Experiments with Azotobacter chroococcum have led to the observation that

When a bacterium exhibits polar growth,

All nitrifying bacteria are obligate chemolithotrophs and obligate aerobes.

Campylobacter and Helicobacter are two genera within the________ class of Proteobacteria.

Which of the following organisms does NOT produce prosthecae?

The most favorable lakes for the development of purple sulfur bacteria are those that are

Nitrifying bacteria develop particularly well in lakes and streams receiving sewage because of the ammonia (NH3) present in the sewage.

Explain how the enteric bacteria can be differentiated by the type and proportion of fermentation products produced by the anaerobic fermentation of glucose.

The epsilon proteobacterium Arcobacter nitrofigilis is often found in a parasitic relationship with the roots of the salt marsh cordgrass Spartina.

Luminescence in bacteria is catalyzed by bacterial

The gram- positive bacteria are a large group of primarily chemoorganotrophic Bacteria.

Which of the following bacteria is the least phylogenetically related to Desulfovibrio?

The very large Spirillum volutans, which was observed by the earliest microscopists, is microaerophilic.

Which of the following is NOT a trait of bioluminescent bacteria?

The oxidation of ammonia to nitrite is carried out by the ________bacteria. The product of this step is subsequently oxidized to nitrate by the _________ bacteria.

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

Vectorborne and Soilborne Microbial Pathogens

Wastewater Treatment, Water Purification, and Waterborne Microbial Diseases

Food Preservation and Foodborne Microbial Diseases

Filters

Nitrifying bacteria develop particularly well in lakes and streams receiving sewage because of the ammonia (NH₃) present in the sewage.

The oxidation of ammonia to nitrite is carried out by the bacteria. The product of this step is subsequently oxidized to nitrate by the _ bacteria.