Exam 19: Microbial Ecosystems

The cells within a biofilm can undergo intra-species signaling; however,inter-species signaling does not occur.

The abundance of cyanobacterial mats has greatly declined due to the evolution of

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

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

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

Which are the MOST dominant chemolithotrophs in pelagic waters?

Shallow marine sediments are dominated by

Limiting nutrients in soils are generally organic compounds.

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

Describe two roles viruses have in the open ocean.

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

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

________ are the main primary producers in freshwater environments.

Chemoheterotrophic bacteria are primary producers.

The most abundant prokaryotic organism in the ocean is of the ________ genus.

Epsilonproteobacteria are most dominant in hydrothermal vents because they

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

The chemical oxygen demand (COD)of a body of water is determined using a(n)

Water in the rocks and soils of Earth's subsurface is called

Arid soils are among the most extreme environments on earth.