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Exam 19: Microbial Ecosystems

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Question 41

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All Prochlorococcus strains contain

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

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Question 42

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Explain three reasons why bacteria form biofilms.

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Biofilms allow bacteria to live in close...

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Question 43

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

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

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

ALL stratified lakes contain a thermocline.

A microbial population can contain several microbial communities.

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

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

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

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

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

Many microbial habitats are unsuitable for plants and animals.

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

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

Purple phototrophic bacteria that use bacteriochlorophyll a are oxygenic.

In the oceans,prokaryotes are outnumbered ten to one by

Sedimentation in bogs and marshes develop ________ soils.

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

Which of the following represents increasing microbial diversity?