Question 1

All Prochlorococcus strains contain

Accepted Answer

A)  chlorophylls a and b.
B)  chlorophyll a and phycobilins.
C)  chlorophyll b and phycobilins.
D)  chlorophylls a and b and phycobilins.

Question 2

ALL stratified lakes contain a thermocline.

Accepted Answer

A) True 
 B)False

Question 3

Archaea and Bacteria dominate the upper 100 m of the open ocean while viruses dominate depths greater than 100 m.

Accepted Answer

A) True 
 B)False

Question 4

Explain three reasons why bacteria form biofilms.

Accepted Answer

Biofilms allow bacteria to live in close...

Question 5

Purple phototrophic bacteria that use bacteriochlorophyll a are oxygenic.

Accepted Answer

A) True 
 B)False

Question 6

The generation time of Escherichia coli in the human intestine is ________ in laboratory culture.

Accepted Answer

A)  at about the same rate as
B)  faster than
C)  more optimal than
D)  slower than

Question 7

Sedimentation in bogs and marshes develop ________ soils.

Accepted Answer

A)  inorganic
B)  mineral
C)  organic
D)  loamy

Question 8

Cells within a biofilm excrete an adhesive matrix primarily composed of ________ but can also contain nucleic acids as well as proteins.

Accepted Answer

A)  lipids
B)  fatty acids
C)  monomers
D)  polysaccharides

Question 9

Many microbial habitats are unsuitable for plants and animals.

Accepted Answer

A) True 
 B)False

Question 10

A microbial population can contain several microbial communities.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following represents increasing microbial diversity?

Accepted Answer

A)  guild-community-population
B)  population-guild-community
C)  cell-community-population
D)  community-guild-population

Question 12

A chemical that comes from outside the ecosystem is referred to as a(n) ________ chemical.

Accepted Answer

A)  synthropic
B)  lithotrophic
C)  allochthonous
D)  pleomorphic

Question 13

In the context of nutrients,a sink is one that slowly releases a particular nutrient over time.

Accepted Answer

A) True 
 B)False

Question 14

Oligotrophic organisms do NOT grow well under nutrient-replete conditions.

Accepted Answer

A) True 
 B)False

Question 15

In the oceans,prokaryotes are outnumbered ten to one by

Accepted Answer

A)  zooplankton.
B)  diatoms.
C)  viruses.
D)  phytoplankton.

Question 16

From the aquatic systems below,where are heterotrophic Bacteria the MOST abundant?

Accepted Answer

A)  coastal waters
B)  deep sea
C)  Sargasso Sea
D)  open ocean

Question 17

Which metric describes the proportion of EACH species present in a community?

Accepted Answer

A)  species abundance
B)  species diversity
C)  species evenness
D)  species richness

Question 18

Two major environmental extremes of the deep sea are high ________ and low ________.

Accepted Answer

A)  pressure / nutrient levels
B)  nutrient levels / pressure
C)  temperature / pressure
D)  oxygen / pressure

Question 19

Cyclic dimeric guanosine monophosphate (c-di-GMP) serves as a messenger molecule in bacterial cells to coordinate a shift from ________ to ________ growth.

Accepted Answer

A)  sessile / planktonic
B)  planktonic / sessile
C)  monomorphic / polymorphic
D)  stationary / exponential

Question 20

The photosynthetic pigments bacteriorhodopsin and proteorhodopsin are present in ________ and ________,respectively.

Accepted Answer

A)  Archaea / Bacteria
B)  Bacteria / Archaea
C)  Bacteria / Bacteria
D)  Bacteria / Eukarya

Exam 19: Microbial Ecosystems

Oligotrophic organisms do NOT grow well under nutrient-replete conditions.

Correct AnswerverifiedShow Answer

The generation time of Escherichia coli in the human intestine is ________ in laboratory culture.

Correct AnswerverifiedShow Answer

Sedimentation in bogs and marshes develop ________ soils.

Correct AnswerverifiedShow Answer

Archaea and Bacteria dominate the upper 100 m of the open ocean while viruses dominate depths greater than 100 m.

Correct AnswerverifiedShow Answer

ALL stratified lakes contain a thermocline.

Correct AnswerverifiedShow Answer

Cyclic dimeric guanosine monophosphate (c-di-GMP) serves as a messenger molecule in bacterial cells to coordinate a shift from ________ to ________ growth.

Correct AnswerverifiedShow Answer

Which of the following represents increasing microbial diversity?

Correct AnswerverifiedShow Answer

The photosynthetic pigments bacteriorhodopsin and proteorhodopsin are present in ________ and ________,respectively.

Correct AnswerverifiedShow Answer

Many microbial habitats are unsuitable for plants and animals.

Correct AnswerverifiedShow Answer

Two major environmental extremes of the deep sea are high ________ and low ________.

Correct AnswerverifiedShow Answer

In the context of nutrients,a sink is one that slowly releases a particular nutrient over time.

Correct AnswerverifiedShow Answer

Explain three reasons why bacteria form biofilms.

Correct AnswerverifiedBiofilms allow bacteria to live in close...View AnswerShow Answer

Which metric describes the proportion of EACH species present in a community?

Correct AnswerverifiedShow Answer

A microbial population can contain several microbial communities.

Correct AnswerverifiedShow Answer

All Prochlorococcus strains contain

Correct AnswerverifiedShow Answer

From the aquatic systems below,where are heterotrophic Bacteria the MOST abundant?

Correct AnswerverifiedShow Answer

In the oceans,prokaryotes are outnumbered ten to one by

Correct AnswerverifiedShow Answer

Cells within a biofilm excrete an adhesive matrix primarily composed of ________ but can also contain nucleic acids as well as proteins.

Correct AnswerverifiedShow Answer

Purple phototrophic bacteria that use bacteriochlorophyll a are oxygenic.

Correct AnswerverifiedShow Answer

A chemical that comes from outside the ecosystem is referred to as a(n) ________ chemical.

Correct AnswerverifiedShow Answer

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Cyclic dimeric guanosine monophosphate (c-di-GMP) serves as a messenger molecule in bacterial cells to coordinate a shift from to growth.

Correct Answer
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The photosynthetic pigments bacteriorhodopsin and proteorhodopsin are present in and ,respectively.

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Two major environmental extremes of the deep sea are high and low .

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Biofilms allow bacteria to live in close...
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