Exam 19: Microbial Ecosystems

An ecosystem includes both the living organisms and abiotic materials that function together.

All Prochlorococcus strains contain

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

Assuming exposure to the same climate,which of the following aquatic systems would be MOST stratified?

Which statement is TRUE about the fluid from the hydrothermal vents?

Explain three reasons why bacteria form biofilms.

Low return of nutrients in the pelagic zone results in relatively low primary production in the open ocean when compared to freshwater lake systems.

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

Sedimentation in bogs and marshes develop ________ soils.

Chemoorganotrophic bacteria can facilitate the formation of soil through the secretion of organic acids.

Functional differences can be observed by using 16S rRNA gene phylogenetics of a microbial community.

Mineral soils largely come from weathered limestone and sand.

Which of the following can function as intracellular signaling molecules?

Limiting nutrients in soils are generally organic compounds.

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

In a stratified lake,the warmer and less dense layer is called the

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

ALL stratified lakes contain a thermocline.

A soil that lacks a dominate particle size is referred to as a(n)

Microbial life has been identified at depths of 3 km despite being anoxic.