D311: WGU Microbiology with Lab: PA
UPDATED ACTUAL Questions and
CORRECT Answers
Which class of cells most often contain extrachromosomal DNA found in plasmids? -
CORRECT ANSWER Prokaryotic
What is the significance of the molecule that makes up the bilayer formed in the plasma
membrane of most bacterial and eukaryotic cells? - CORRECT ANSWER Phospholipids
help maintain hydrophobic and hydrophilic environments.
Which microorganisms produce dermatophytes that can cause skin infections, such as athlete's
foot and ringworm? - CORRECT ANSWER Fungi
Which microorganisms can produce human pathogens that spread via microsporidia? -
CORRECT ANSWER Fungi
Why are archaea considered prokaryotic organisms? - CORRECT ANSWER Their cells
do not contain a nucleus.
Why is MRSA more pathogenic than other strains of Staphylococcus aureus? - CORRECT
ANSWER MRSA has increased antibiotic resistance.
A patient recently had an outpatient surgical procedure. After a few days at home, they noticed
swelling and redness at their incision site. How would this infection be classified? - CORRECT
ANSWER Iatrogenic
Which viral virulence factor requires adjustments to the influenza vaccine annually? -
CORRECT ANSWER Antigenic variation
, Which pair of enzymes are produced by some bacteria that causes the clotting of blood to protect
the bacteria in the bloodstream, then a digestion of the clots to allow the bacteria to spread? -
CORRECT ANSWER Coagulase and kinase
How does coinfection of a single cell by multiple strains of a virus increase it's pathogenicity? -
CORRECT ANSWER Coinfection provides the opportunity for an antigenic shift.
Canned food is heated and sealed in sterile containers to provide a longer shelf life and prevent
spoilage. Improper canning results in the growth of microorganisms, which may result in food
containers that swell and explode.
Which staining technique can be used to identify these microorganisms? - CORRECT
ANSWER Endospore staining
A student in a lab has just completed an endospore stain of Bacillus anthracis and realized that
heat was not applied during the staining technique.
What will the student see upon microscopic examination of the slide? - CORRECT
ANSWER Pink vegetative cells with clear round areas.
A physician is given a vaginal swab in order to test for post-antibiotic vaginal infection.
Which microscopic technique would identify opportunistic fungal pathogen? - CORRECT
ANSWER Wet mount stain
A technician has just performed a Gram stain but forgot to add the safranin.
What is the likely result of this when viewed microscopically? - CORRECT
ANSWER Gram-negative organisms can not be seen under the microscope.
UPDATED ACTUAL Questions and
CORRECT Answers
Which class of cells most often contain extrachromosomal DNA found in plasmids? -
CORRECT ANSWER Prokaryotic
What is the significance of the molecule that makes up the bilayer formed in the plasma
membrane of most bacterial and eukaryotic cells? - CORRECT ANSWER Phospholipids
help maintain hydrophobic and hydrophilic environments.
Which microorganisms produce dermatophytes that can cause skin infections, such as athlete's
foot and ringworm? - CORRECT ANSWER Fungi
Which microorganisms can produce human pathogens that spread via microsporidia? -
CORRECT ANSWER Fungi
Why are archaea considered prokaryotic organisms? - CORRECT ANSWER Their cells
do not contain a nucleus.
Why is MRSA more pathogenic than other strains of Staphylococcus aureus? - CORRECT
ANSWER MRSA has increased antibiotic resistance.
A patient recently had an outpatient surgical procedure. After a few days at home, they noticed
swelling and redness at their incision site. How would this infection be classified? - CORRECT
ANSWER Iatrogenic
Which viral virulence factor requires adjustments to the influenza vaccine annually? -
CORRECT ANSWER Antigenic variation
, Which pair of enzymes are produced by some bacteria that causes the clotting of blood to protect
the bacteria in the bloodstream, then a digestion of the clots to allow the bacteria to spread? -
CORRECT ANSWER Coagulase and kinase
How does coinfection of a single cell by multiple strains of a virus increase it's pathogenicity? -
CORRECT ANSWER Coinfection provides the opportunity for an antigenic shift.
Canned food is heated and sealed in sterile containers to provide a longer shelf life and prevent
spoilage. Improper canning results in the growth of microorganisms, which may result in food
containers that swell and explode.
Which staining technique can be used to identify these microorganisms? - CORRECT
ANSWER Endospore staining
A student in a lab has just completed an endospore stain of Bacillus anthracis and realized that
heat was not applied during the staining technique.
What will the student see upon microscopic examination of the slide? - CORRECT
ANSWER Pink vegetative cells with clear round areas.
A physician is given a vaginal swab in order to test for post-antibiotic vaginal infection.
Which microscopic technique would identify opportunistic fungal pathogen? - CORRECT
ANSWER Wet mount stain
A technician has just performed a Gram stain but forgot to add the safranin.
What is the likely result of this when viewed microscopically? - CORRECT
ANSWER Gram-negative organisms can not be seen under the microscope.
