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College Microbiology Questions

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College Microbiology
Staphylococcus aureus is what kind of organism?
  1. Pseudopod
  2. Eukaryote
  3. Alage
  4. Prokaryote
College Microbiology
Which is more dangerous to human beings-antigenic DRIFT or antigenic SHIFT-and why?
  1. Antigenic DRIFT-since this produces the quickest and largest degree of changes in the virus structure and we may not have immunity against it.
  2. Antigenic SHIFT-since this produces the quickest and largest degree of changes in the virus structure and we may not have immunity against it.
  3. Antigenic DRIFT-the small changes make the virus look like something we already have an immune response in place for, but we actually don't. This lets the virus hide from the immune responses needed to clear it out for a longer period of time.
  4. Antigenic SHIFT-the process completely changes the virus 100%, allowing it to jump into different species (i.e., from birds into humans). As such, we have no responses in place for the new virus.
College Microbiology
The three main bacteria morphologies are known as                            .
  1. coccus, bacilli, and spiral
  2. coccus, sphere, and star
  3. boccus, cacilli, and spiral
  4. cocoid, bacoid, and spiroid
College Microbiology
The eyes are protected from infection by                                                                                 .
  1. the washing action of the tears and eyelids.
  2. the use of contact lenses.
  3. the dryness of the eye surface.
  4. the washing action of the tears and eyelids AND the chemical action of lysozyme.
College Microbiology
The MMR vaccine is used to protect against                               .
  1. mononucleosis, mumps, rubella.
  2. mononucleosis, mange, rubeola.
  3. measles, mange, rubeola.
  4. measles, mumps, rubella.
College Microbiology
College Microbiology
Which of the following organisms is not normally found on the skin?
  1. Staphylococci
  2. Malassezia spp.
  3. Diptheroids
  4. Candida spp.
College Microbiology
Explain how Vibrio cholerae causes cholera without apparent damage to the intestinal epithelium.
  1. This microbe causes destruction of the cellular structures underneath the intestinal epithelium-this is what induces the watery rice-stool characteristic of the illness. This leaves the overlying intestinal epithelium intact.
  2. This microbe directly invades the intestinal epithelial cells, but does not kill them. Instead, while multiplying inside them, it causes them to secrete large amounts of chloride ions. This induces water to follow by osmosis, resulting in the watery rice-stool characteristic of the illness.
  3. This microbe attaches to the surface of intestinal epithelial cells, secreting an exotoxin that causes the epithelium to secrete large amounts of chloride ions. This induces large amounts of water to follow by osmosis, resulting in the watery rice-stool characteristic of the illness.
  4. The inflammatory reaction to the presence of this microbe causes the watery rice-stool characteristic of the illness. Therefore, it's technically the immune response that initiates the disease, although this response is induced by the presence of the microbe on the intestinal epithelium.
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