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37 terms

Microbiology

STUDY
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Which of the following organisms is using sulfur as a source of energy?
Thiobacillus: H2S → S0
Which of the following is NOT a symbiotic pair of organisms?
Sulfur and Thiobacillus
Which of the following pairs is mismatched?
Bacillus - hard cheese
In which of the following animals would you expect to find a specialized organ that holds cellulose-degrading bacteria and fungi?
Termite
Adding untreated sewage to a freshwater lake would cause the biochemical oxygen demand to
Increase
6H2S + 6CO2 6S0 + glucose
Takes place under anaerobic conditions.
Nitrogen fixation
Requires anaerobic conditions.
Sludge digestion
Takes place under anaerobic conditions.
Primary sewage treatment
The amount of oxygen doesn't make any difference.
Which of the following pairs is mismatched?
Algae - citric acid
Which reaction makes wine less acidic?
Malic acid → Lactic acid
Which of the following is the reason canning preserves foods?
Anaerobic environment and heat
Which of the following is the reason aseptic packaging preserves foods?
Heat
Which of the following is the reason radiation preserves foods?
Lethal mutations
You are growing Bacillus subtilis in a bioreactor and notice that the growth rate has slowed and the pH has decreased. You suspect the bacteria are
Fermenting
Assume that you bought a semisoft cheese, such as blue cheese, and put it into your refrigerator. Three weeks later, you slice the cheese and notice the center is now liquid because
Fungal enzymes have digested the curd.
The following steps are required for making cheese. Which is the second step?
Inoculate with lactic acid bacteria
Which of the following is true of a commensal bacterium?
May be an opportunistic pathogen
Which of the following statements is true?
Symbiosis refers to different organisms living together.
A nosocomial infection is
Acquired during the course of hospitalization
The major significance of Koch's work was that
Microorganisms cause disease.
Koch's postulates don't apply to all diseases because
Not all diseases are caused by microorganisms.
The most frequently used portal of entry for pathogens is the
Mucous membranes of the respiratory tract.
Which of the following diseases is NOT usually contracted by the respiratory route?
Infectious hepatitis
Most pathogens that gain access through the skin
Enter through hair follicles and sweat ducts.
Which of the following does NOT contribute to a pathogen's invasiveness?
Toxins
Which of the following statements is false?
Coagulase destroys blood clots.
Which of the following best defines innate immunity?
The body's defenses against any kind of pathogen
Which of the following is NOT a physical factor protecting the skin and mucous membranes from infection?
Lysozyme
The function of the "ciliary escalator" is to
Remove microorganisms from the lower respiratory tract.
Which of the following exhibits the highest phagocytic activity?
Neutrophils
TLRs attach to all of the following EXCEPT
AMPs
What type of immunity results from vaccination?
Artificially acquired active immunity
What type of immunity results from transfer of antibodies from one individual to a susceptible individual by means of injection?
Artificially acquired passive immunity
What type of immunity results from recovery from mumps?
Naturally acquired active immunity
A human's resistance to canine distemper is an example of
Innate immunity
Newborns' immunity due to the transfer of antibodies across the placenta is an example of
Naturally acquired passive immunity.