Exam 20: Microbial Ecosystems

Explain three reasons why bacteria form biofilms.

________ use inorganic electron donors released from deep-sea hydrothermal vents.

Which of the following is an example of a biofilm?

The formation of soil involves a combination of biological, chemical, and physical processes.

Which bacterial genus is responsible for producing ferrous iron (Fe²⁺) in groundwater?

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

Water in the rocks and soils of Earthʹs subsurface is called

How does the concentration of prokaryotic cells at the surface of pelagic water compare with the concentrations at depths below 1000 m?

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

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

Epsilonproteobacteria are most dominant in hydrothermal vents because they

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

A microbial population can contain several microbial communities.

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 population consists of

________ are the main primary producers in freshwater environments.

The primary metal sulfides emitted from the black smokers are ________ sulfides.

A notorious biofilm former implicated in cystic fibrosis is

According to bacterial abundance studies done so far on soils, the ________ represent the most abundant phylum.

Mineral soils largely come from weathered limestone and sand.