Question 1

Plasmodium falciparum is a protistan parasite,borne by mosquitoes,that constitutes a serious health problem for humans.The disease it causes is:

Accepted Answer

A)  diabetes
B)  malaria
C)  yellow fever
D)  dengue fever
E)  Lyme diseaseF) C) and D)
G) None of the above

Question 2

Methanotrophs affect global temperature.This is because:

Accepted Answer

A)  Methanotrophs metabolize methane,thereby reducing the amount of methane in the atmosphere.Since methane is one of the greenhouse gases whose accumulation causes a rise in global temperature,its reduction by methanotrophs helps prevent global warming.
B)  Methanotrophs convert methane to carbon dioxide and increase the amount of carbon dioxide in the atmosphere.Since carbon dioxide is one of the greenhouse gases whose accumulation causes a rise in global temperature,its production by methanotrophs contributes to global warming.
C)  Methanotrophs convert carbon dioxide to methane and increase the amount of methane in the atmosphere.Since methane is one of the greenhouse gases whose accumulation causes a rise in global temperature,its production by methanotrophs contributes to global warming.
D)  Methanotrophs convert methane to carbon dioxide,thereby decreasing the amount of methane in the environment but increasing the amount of carbon dioxide there.Since both methane and carbon dioxide are greenhouse gases whose accumulation causes a rise in global temperature,the decrease in one cancels the increase in the other and methanotrophs have no net effect on global warming.
E)  Methanotrophs combine carbon dioxide and methane to form petroleum and in this way take both methane and carbon dioxide out of the atmospherE.Since both methane and carbon dioxide are greenhouse gases whose accumulation causes a rise in global temperature,the decrease in both helps prevent global warming.F) A) and E)
G) B) and C)

Question 3

Which of the following is NOT a way that bacteria benefit humans?

Accepted Answer

A)  production of foodstuffs such as cheese
B)  production of antibiotics
C)  breaking down wastes,toxins,explosives,and petrochemicals
D)  killing harmful insects
E)  transferring nutrients across intestinal membranesF) A) and C)
G) All of the above

Question 4

Archaea that tolerate and/or require high salinities are called halophiles.

Accepted Answer

A) True 
 B)False

Question 5

The proteobacterium Rhizobium lives in a close association with legume roots,providing a source of nitrogen for the plant.In return,the plant provides Rhizobium with food produced by photosynthesis.In this relationship,Rhizobium is an example of a(n) :

Accepted Answer

A)  pathogen
B)  parasite
C)  producer
D)  methanogen
E)  mutualistF) A) and E)
G) A) and D)

Question 6

The group of protists to which you are most closely related is:

Accepted Answer

A)  the choanoflagellates
B)  slime molds
C)  Rhizaria
D)  Foraminifera
E)  StramenopilaF) B) and C)
G) B) and E)

Question 7

Members of the supergroup Amoebozoa are characterized by:

Accepted Answer

A)  locomotion via pseudopodia
B)  hard shells composed of calcium carbonate
C)  plastids acquired through tertiary endosymbiosis
D)  alveoli beneath the plasma membrane
E)  the presence of a feeding grooveF) A) and D)
G) A) and E)

Question 8

Phytophthora infestans is a pathogen that attacks a variety of plants.This pathogen is an example of what type of protist?

Accepted Answer

A)  algae
B)  fungus-like protists
C)  protozoans
D)  periphyton
E)  planktonF) All of the above
G) A) and E)

Question 9

Red algae,green algae,and plants are so closely related that they are grouped in the same supergroup by most biologists.

Accepted Answer

A) True 
 B)False

Question 10

Which statement most accurately describes the evolutionary relationships among the three domains?

Accepted Answer

A)  Bacteria and Archaea diverged from a common ancestor more recently than they diverged from their common ancestor with EukaryA.
B)  Bacteria and Eukarya diverged from a common ancestor more recently than they diverged from their common ancestor with Archaea.
C)  Eukarya and Archaea diverged from a common ancestor more recently than they diverged from their common ancestor with Bacteria.
D)  All three domains diverged from a common ancestor at the same time.E) All of the above
F) A) and D)

Question 11

You are studying the bacteria in the water of a nearby pond.From a 100 mL sample,you use a 0.5 mL subsample to inoculate a plastic dish filled with a semisolid nutrient medium that fosters growth of coliform bacteria.After an appropriate incubation period,you count 100 bacterial colonies growing on the surface of the medium.What conclusion can you make about the coliform bacteria in the pond water?

Accepted Answer

A)  There is approximately one coliform bacterial cell per milliliter.
B)  There are approximately 200 coliform bacterial cells per milliliter.
C)  There is approximately one coliform bacterial species per milliliter.
D)  There are approximately 200 coliform bacterial species per milliliter.E) B) and D)
F) B) and C)

Question 12

Most extremophiles are archaea.

Accepted Answer

A) True 
 B)False

Question 13

The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen.That group of bacteria was:

Accepted Answer

A)  cyanobacteria
B)  spirochaetes
C)  proteobacteria
D)  Staphylococcus
E)  actinobacteriaF) B) and D)
G) C) and E)

Question 14

In the Gulf of Mexico,red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans.As an environmental scientist,what would you suggest concerned citizens do to help prevent these red tides?

Accepted Answer

A)  Purchase fuel-efficient vehicles
B)  Decrease the amount of artificial light in coastal areas
C)  Encourage sustainable fishing
D)  Reduce fertilizer use on lawns and gardens
E)  Participate in beach cleanup effortsF) B) and D)
G) A) and E)

Question 15

Protists are organisms that are generally microscopic,live in moist environments,and cannot be classified in the animal,plant,or fungal kingdoms.

Accepted Answer

A) True 
 B)False

Question 16

Protozoa are monophyletic.

Accepted Answer

A) True 
 B)False

Question 17

An obligate anaerobe is an organism that:

Accepted Answer

A)  is poisoned by oxygen
B)  requires oxygen
C)  can use oxygen but can get along without it
D)  does not use oxygen but is not poisoned by it
E)  produces oxygenF) A) and D)
G) C) and E)

Question 18

Mitochondria originated from proteobacteria.

Accepted Answer

A) True 
 B)False

Question 19

Amphistegina gibbosa is a species of protist with filose pseudopodia found near coral reefs.What cannot be true of A. gibbosa?

Accepted Answer

A)  They are enclosed within a shell composed of calcium carbonate.
B)  They have sacs under the cell membrane.
C)  They are heterotrophic.
D)  They are closely related to radiolarians.E) B) and C)
F) A) and C)

Question 20

Which of the following statements does NOT describe a function of the cell walls of bacteria?

Accepted Answer

A)  They maintain cell shape.
B)  They prevent horizontal gene transfer.
C)  They avoid disintegration in water with low concentrations of salt.
D)  They protect against other bacteria.
E)  They protect against viruses.F) A) and B)
G) B) and C)

Exam 22: Microorganisms: The Archaea, Bacteria, and Protists

Mitochondria originated from proteobacteria.

Correct Answer
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Methanotrophs affect global temperature.This is because:

Correct Answer
verified

In the Gulf of Mexico,red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans.As an environmental scientist,what would you suggest concerned citizens do to help prevent these red tides?

Correct Answer
verified

The proteobacterium Rhizobium lives in a close association with legume roots,providing a source of nitrogen for the plant.In return,the plant provides Rhizobium with food produced by photosynthesis.In this relationship,Rhizobium is an example of a(n) :

Correct Answer
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Members of the supergroup Amoebozoa are characterized by:

Correct Answer
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Correct Answer
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An obligate anaerobe is an organism that:

Correct Answer
verified

Which of the following is NOT a way that bacteria benefit humans?

Correct Answer
verified

The group of protists to which you are most closely related is:

Correct Answer
verified

Red algae,green algae,and plants are so closely related that they are grouped in the same supergroup by most biologists.

Correct Answer
verified

The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen.That group of bacteria was:

Correct Answer
verified

Protists are organisms that are generally microscopic,live in moist environments,and cannot be classified in the animal,plant,or fungal kingdoms.

Correct Answer
verified

Which statement most accurately describes the evolutionary relationships among the three domains?

Correct Answer
verified

Archaea that tolerate and/or require high salinities are called halophiles.

Correct Answer
verified

Phytophthora infestans is a pathogen that attacks a variety of plants.This pathogen is an example of what type of protist?

Correct Answer
verified

Plasmodium falciparum is a protistan parasite,borne by mosquitoes,that constitutes a serious health problem for humans.The disease it causes is:

Correct Answer
verified

Which of the following statements does NOT describe a function of the cell walls of bacteria?

Correct Answer
verified

Most extremophiles are archaea.

Correct Answer
verified

Amphistegina gibbosa is a species of protist with filose pseudopodia found near coral reefs.What cannot be true of A. gibbosa?

Correct Answer
verified

Protozoa are monophyletic.

Correct Answer
verified

Exam 22: Microorganisms: The Archaea, Bacteria, and Protists

Mitochondria originated from proteobacteria.

Correct AnswerverifiedShow Answer

Methanotrophs affect global temperature.This is because:

Correct AnswerverifiedShow Answer

In the Gulf of Mexico,red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans.As an environmental scientist,what would you suggest concerned citizens do to help prevent these red tides?

Correct AnswerverifiedShow Answer

The proteobacterium Rhizobium lives in a close association with legume roots,providing a source of nitrogen for the plant.In return,the plant provides Rhizobium with food produced by photosynthesis.In this relationship,Rhizobium is an example of a(n) :

Correct AnswerverifiedShow Answer

Members of the supergroup Amoebozoa are characterized by:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An obligate anaerobe is an organism that:

Correct AnswerverifiedShow Answer

Which of the following is NOT a way that bacteria benefit humans?

Correct AnswerverifiedShow Answer

The group of protists to which you are most closely related is:

Correct AnswerverifiedShow Answer

Red algae,green algae,and plants are so closely related that they are grouped in the same supergroup by most biologists.

Correct AnswerverifiedShow Answer

The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen.That group of bacteria was:

Correct AnswerverifiedShow Answer

Protists are organisms that are generally microscopic,live in moist environments,and cannot be classified in the animal,plant,or fungal kingdoms.

Correct AnswerverifiedShow Answer

Which statement most accurately describes the evolutionary relationships among the three domains?

Correct AnswerverifiedShow Answer

Archaea that tolerate and/or require high salinities are called halophiles.

Correct AnswerverifiedShow Answer

Phytophthora infestans is a pathogen that attacks a variety of plants.This pathogen is an example of what type of protist?

Correct AnswerverifiedShow Answer

Plasmodium falciparum is a protistan parasite,borne by mosquitoes,that constitutes a serious health problem for humans.The disease it causes is:

Correct AnswerverifiedShow Answer

Which of the following statements does NOT describe a function of the cell walls of bacteria?

Correct AnswerverifiedShow Answer

Most extremophiles are archaea.

Correct AnswerverifiedShow Answer

Amphistegina gibbosa is a species of protist with filose pseudopodia found near coral reefs.What cannot be true of A. gibbosa?

Correct AnswerverifiedShow Answer

Protozoa are monophyletic.

Correct AnswerverifiedShow Answer

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