Exam 20: Microbial Ecosystems

Sudden nutrient perturbations in an environment generally ________ the overall prokaryotic diversity.

A chemical that comes from outside the ecosystem is referred to as a(n) ________ chemical.

Which of the following represents increasing microbial diversity?

Ecological theory states that for every organism there is at LEAST one ________, and the microenvironment where the organism is most successful is called the ________.

A population of metabolically related microorganisms is called a(n)

Which of the following is NOT an oxygenic phototrophic microorganism present in marine waters?

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

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

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

In a stratified lake, the warmer and less dense layer is called the

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

Which is the correct order of increasing size in soil particles?

All Prochlorococcus strains contain the pigments

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

Describe two roles viruses have in the open ocean.

In many marine systems, the carbon and oxygen cycles are directly proportional to each other.

Biofilm structure is determined by

Functional differences can be observed by using 16S rRNA gene phylogenetics of a microbial community.

All stratified lakes contain a thermocline.

Biomass generation due to heterotrophic organisms is called ________ production.