Exam 20: Microbial Ecosystems

Which metric describes the proportion of EACH species present in a community?

Soil particles are classified based on their size.

The generation time of Escherichia coli in the human intestine is ________ in laboratory culture.

Limiting nutrients in soils are generally organic compounds.

In deep pelagic waters, the archaeal species present are almost all members of the

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

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

The number of Roseobacter in the ocean describes

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

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

Which metabolic strategy is most common in chemolithotrophic mats?

Which aquatic habitat contains a pelagic zone?

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

Purple phototrophic bacteria that use bacteriochlorophyll a are oxygenic.

Arid soils are among the most extreme environments on earth.

What adaptation allows organisms to tolerate high pressures?

Cyclic di-guanosine monophosphate is upregulated as Pseudomonas aeruginosa cells are declining.

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

Archaea and Bacteria dominate the upper 100 m of the open ocean while viruses dominate depths greater than 100 m.

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