Exam 19: Microbial Ecosystems

A microbial population can contain several microbial communities.

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

All Prochlorococcus strains contain

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

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

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

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

ALL stratified lakes contain a thermocline.

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

Which of the following represents increasing microbial diversity?

Many microbial habitats are unsuitable for plants and animals.

In the oceans,prokaryotes are outnumbered ten to one by

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

Explain three reasons why bacteria form biofilms.

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

Sedimentation in bogs and marshes develop ________ soils.

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

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

Purple phototrophic bacteria that use bacteriochlorophyll a are oxygenic.

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