Exam 20: Microbial Ecosystems

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

The microbial oxygen-consuming capacity of a water sample is called its

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

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

In the oceans, prokaryotes are greatly outnumbered by

Phylogenetic analyses of marine prokaryotic diversity in both shallow and deep-sea marine sediments have found that both types of sediments are dominated by

Explain why biofilms are a concern in medicine.

Explain how both biochemical oxygen demand and chemical oxygen demand are measured.

Chemoheterotrophic bacteria are primary producers.

Gammaproteobacteria can be used for biodegradation of hydrocarbons.

What is the difference between an organism being piezophilic and piezotolerant?

During periods of stratification, transfer between surface and bottom waters is controlled by

Sedimentation in bogs and marshes develop ________ soils.

Many microbial habitats are unsuitable for plants and animals.

What advantage do proteorhodopsin-containing organisms have over other heterotrophic microbes in the open ocean?

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

In the soil, oxygen concentrations are highly variable even within a soil particle. The center of the particle may be anoxic even if the outer portions are oxygen rich. In this context, facultative anaerobes could be found

The physiochemical conditions of a microenvironment, by definition, remain static.

Unlike other cyanobacteria, Prochlorococcus lacks phycobilins.

An organism living in the bottommost region of a body of water is described as being