Exam 19: Microbial Ecosystems

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

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

Gammaproteobacteria can be used for biodegradation of hydrocarbons.

Which aquatic habitat contains a pelagic zone?

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

Describe three molecular effects high pressure has on the physiology of organisms.

Chemoheterotrophic bacteria are primary producers.

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

A microbial population can contain several microbial communities.

Describe two roles viruses have in the open ocean.

Biomass generation due to heterotrophic organisms is called ________ production.

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

Shallow marine sediments are dominated by

Describe four environmental conditions that would likely change the relative abundances of the members within a microbial community.

Some nitrifying prokaryotes carry out metabolic cooperation by a process known as

Due to such an array of nutrients,microorganisms are often capable of sustaining exponential growth in the environment.

Archaea in pelagic deep-water are almost exclusively

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

________ are the main primary producers in freshwater environments.

Provide a reason for the ecological importance of pelagic Bacteria and Archaea.