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Microbiology Chapter 11 potential test questions

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All prokaryotes reproduce sexually.

false - asexually


A bacillus is a bacterium with a slightly curved rod shape.

false - vibrio


If you were to view staphylococci, you should expect to see clusters of cells.



Chlamydias have peptidoglycan cell walls.

false - lack


Archaea are classified into phyla based primarily on tRNA sequences.

false - rRna


Halophiles inhabit extremely saline habitats such as the Great Salt Lake.



Pigments located in the thylakoids in the phototrophic bacteria trap light energy for metabolic processes.



Most cyanobacteria form heterocysts in which nitrogen fixation occurs.



A giant bacterium that is large enough to be seen without a microscope is Selenomonas.

false - epulopiscium


When environmental nutrients are depleted, myxobacteria aggregate in mounts to form fruiting bodies.



The type of reproduction in prokaryotes that results in palisade arrangement of cells is called ___________________.

  1. pleomorphic division
  2. endospore formation
  3. snapping division
  4. binary fission

c. snapping division


The thick-walled reproductive spores produced in the middle of cyanobacterial filaments are called ______________________.

  1. akinetes
  2. terminal endospores
  3. metachromatic granules
  4. heterocysts

a. akinetes


Which of the following terms best describes stiff, spiral shaped prkaryotic cells?

  1. cocci
  2. bacilli
  3. spirilla
  4. spirochetes

c. spirilla


Endospores _________.

  1. can remain alive for decades.
  2. can remain alive in boiling water
  3. exist in a state of suspended animation
  4. all of the above

d. all of the above


How is halobacterium salinarium distinctive?

  1. It is absolutely dependent on high salt concentrations to maintain its cell wall.
  2. It is found in terrestrial volcanic habitats
  3. It photosynthesizes without chlorophyll
  4. It can survive 5 million rad of radiation

a. it is absolutely dependent on high salt concentrations to maintain its cell wall.


Photosynthetic bacteria that also fix nitrogen are _______________.

  1. mycoplasmas
  2. spirilla
  3. bacteroids
  4. cyanobacteria

d. cyanobacteria


Which genus is the most common anaerobic human pathogen?

  1. Bacteroides
  2. Spirochetes
  3. Chlamydia
  4. Methanopyrus

a. Bacteroides


Flexible spiral shaped prokaryotes are _______________.

  1. spirilla
  2. spirochetes
  3. vibrios
  4. rickettsias

b. spirochetes


Bacteria that convert nitrogen gas into ammonia are _____________.

  1. nitrifying bacteria
  2. nitrogenous
  3. nitrogen fixers
  4. nitrification bacteria

c. nitrogen fixers


The presence of mycolic acid in the cell wall characterizes ____________.

  1. Corynebacterium
  2. Listeria
  3. Nocardia
  4. Mycobacterium

d. Mycobacterium

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