Chapter 29 Quiz
Terms in this set (25)
While examining a rock surface, you have discovered an interesting new organism. Which of the following criteria will allow you to classify the organism as belonging to Bacteria but not Archaea or Eukarya?
Cell walls are made primarily of peptidoglycan
To establish a link between a specific bacterium and a skin disease, researchers have shown that bacterium was present in sick persons but not in healthy individuals. They isolated the bacterium in a pure culture and demonstrated that experimental healthy animals injected with this culture became sick. What other experiment do researchers need to perform to be absolutely sure that the bacterium is responsible for the disease?
Isolate bacterium from an infected sick animal and demonstrate that it is the same bacterium as the one used for infection.
Chemicals, secreted by soil fungi, which inhibit the growth of bacteria, are known as _____.
Broad-spectrum antibiotics inhibit the growth of most intestinal bacteria. Consequently, assuming that nothing is done to counter the reduction of intestinal bacteria, a hospital patient who is receiving broad-spectrum antibiotics is most likely to become _____.
deficient in certain vitamins and nutrients
Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference between Gram-positive and Gram-negative bacteria?
presence or absence of outer plasma membrane
Biologists sometimes divide living organisms into two groups: autotrophs and heterotrophs.
These two groups differ in _____.
their mode of nutrition
A prokaryote that obtains energy from light is a(n) _____.
The purple non-sulfur bacterium Rhodospirillum grows best as a photoheterotroph. What are the most favorable sources of energy and carbon for this bacterium?
fructose and light
A newly discovered organism is found to use sulfide (S2-) for aerobic respiration and use
carbon dioxide (CO2) from the air as a source of carbon, much like a plant. This organism must
be a _____.
When some bacteria use lactose as a source of energy, they produce propionic acid and carbon
dioxide. What is the name for this process?
A biologist trying to determine the mechanism of adenosine triphosphate (ATP) production in a
newly discovered bacterium provides several different substrates on which the bacteria can feed.
Which of the following results would indicate that the species uses fermentation to produce
After exposure to amino acids, the bacteria produce a smell like rotting flesh.
During cellular respiration, some bacteria use methane (CH4) as an electron donor and oxygen
(O2) as an electron acceptor. What is the name for this group of bacteria?
Which of the following extremophiles might researchers with an evolutionary worldview most
likely use as a model for the earliest organisms on Earth?
an anaerobic archaean species
Which of the following traits do archaeans and bacteria share?
lack of a nuclear envelope and presence of plasma membrane
Prokaryotes are classified as belonging to two different domains. What are the domains?
Bacteria and Archaea
A water sample from a hot thermal vent contained a single-celled organism that had a cell wall
but lacked a nucleus. What is its most likely classification?
What organisms are most numerous on Earth?
Which of the following describe all existing bacteria?
tiny, ubiquitous, metabolically diverse
You acquire a soil sample and run an enrichment culture on it. You provide the organisms in the
culture with all of the ingredients required for growth except for nitrogen. What result do you
expect to have at the end of your experiment?
Nitrogen-fixing bacteria will significantly outnumber those incapable of fixing nitrogen
Which of the following groups is characterized by unusual flagella contained within a structure
called the outer sheath?
What is the characteristic feature of the Chlamydiales phylum?
parasitic life cycle
You run an osteology lab, where students are able to study the bone structure of various species.
To produce clean bones, you introduce insects and bacteria to remove all remaining flesh. Which
bacteria would be the best purchase for your lab?
While examining soil from a cornfield, you found a new type of bacteria that turns purple when
treated with Gram stain. What lineage might it belong to?
Plantlike photosynthesis that releases oxygen (O2) occurs in _____.
Researchers have found a new type of bacteria, and they want to determine its phylum. What
would be the most reliable method to do so?
Determine the ribosomal RNA sequence of the bacteria.
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