Question 1

Describe the cell wall of the verrucomicrobia. How could these organisms have acquired this trait?

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Question 2

Compare and contrast the double membrane found in planctomycetes versus that found in the eukaryotic nucleus.

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Question 3

What is unique about the genome of Borrelia species?

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Question 4

How do Bacteroides fragilis and B. thetaiotaomicron contribute as 15% of human caloric intake? Are there other benefits provided by these microbes to human health? Are they potentially pathogenic?

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Question 5

Describe the unique way in which spirochetes can be isolated from other environmental species. What makes this possible?

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Question 6

Describe the metabolic characteristics of Chlorobium species.

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Question 7

The epsilonproteobacterium Helicobacter pylori is the cause of gastritis and stomach ulcers. What mechanism allows it to survive the acidic conditions of the mammalian stomach?

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Question 8

After the metagenome from the Sargasso Sea was sequenced, some free-living rickettsias were found. What was surprising about that find and, more surprisingly, what were some of the rickettsias found to possess? How might this have been acquired?

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Question 9

After reading the news of an E. coli threat in the community, your family and friends ask you, "Is E. coli a pathogen?" What would you answer?

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Question 10

Briefly describe the cellular structure of spirochetes and their motility system.

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Quiz 18: Bacterial Diversity