Exam 15: Diversity of Bacteria

To subgroup the lactic acid bacteria,which are incapable of aerobic degradation and only do fermentation,identifying products formed is a useful way to distinguish homofermentative versus heterofermentative lactic acid bacteria.

Select a group within Bacteria that has a rare structural morphology observable with a microscope.Describe the appearance,the group that it corresponds to,and another group that would certainly be ruled out when observing such a morphology.

Which genus would you MOST likely find in the photic layer of the oceans due to its abundance and aerobic chemoorganotroph phenotype?

Chemolithotrophic ammonia-oxidization is a metabolic requirement for members of

Considering the evolution of Bacteria,the criteria used for taxonomy,and the genetic requirements for individual metabolic pathways,explain how it is unlikely to observe three genera of the same family where one genus has strict anaerobes that degrade only small aromatics,another genus degrades large molecular weight sugars aerobically,and a third is a photoautotroph.

Some Streptomyces spp.can biosynthesize several chemically unrelated structures that act as different antibiotics.

Proteobacteria members thrive in soils and occur at high concentrations as well.Other bacterial taxa are considered much less diverse in terms of their metabolic capabilities.Due to the role isolation has in discovering metabolic pathways,consider how obtaining hundreds of new isolates from a less studied phylum might change our views on metabolic diversity.Predict how the results of discovering another highly metabolically diverse group might be handled in terms of taxonomic assignment.

Rhodobacter and Roseobacter are two genera with a common ancestor in Alphaproteobacteria.

Thermotoga are hyperthermophiles and appear relatively closely related to Archaea in comparison to other bacteria such as Salmonella.

The order Lactobacillales within Firmicutes are also called the lactic acid bacteria,because these bacteria

Bacteria in the phylum ________ occur as elementary or reticulate bodies depending on their life cycle stage,are obligate intracellular parasites,and also have relatively small genomes.

Mycolic acids are exclusively present in Mycobacterium spp.and can be distinguished by a(n)________ staining procedure (which is,therefore,a diagnostic utility to identify mycobacteria).

The hypothesis that H₂ was a key electron donor for energy metabolism in primitive organisms is supported by it being such a common trophic strategy in Aquificae.

The MOST metabolically diverse phylum of Bacteria known to date is the Proteobacteria.

Pseudomonads are aerobic,gram-positive,polar flagellated,bacillus-shaped cells.

Which bacterial genus would be best to select for fermenting cabbage to make homemade sauerkraut?

Campylobacter and Helicobacter are two genera within the ________ class of Proteobacteria.

Which structural feature is common in BOTH Planctomycetes and Verrucomicrobia but RARELY found in bacteria outside these two phyla?

Treating wastewater requires the removal of organic material,and an ideal phenotype of a bacterium to do this would flocculate to make the cells settle (rather than staying in suspension)in a wastewater stream.Which species would be best for this application?

Which of the following is NOT true of Epsilonproteobacteria?