Question: The following are Koch’s Postulates, in random order. Which is the correct order?
(1) The suspected organism is grown in pure culture
(2) Cells from a pure culture of the suspected organism should cause disease in a healthy animal
(3) The organism is re-isolated and shown to be the same as the original
(4) The suspected pathogen should be present in all cases of the disease and absent from healthy animals.
1, 3, 2, 4
3, 4, 1, 2

Answer Choices:
3, 1, 2, 4
4, 1, 2, 3
1, 2, 4, 3

Answer: 4, 1, 2, 3

 

Question: Infection with which herpesvirus can lead to lifelong neurological damage or death in fetuses and/or infants?
Adenoviruses

Answer Choices:
Varicella zoster
Cytomegalovirus
Epstein-Barr

Answer: Cytomegalovirus

 

Question: It is important to wash your hands with soap and water upon entering the laboratory, but unnecessary before leaving the laboratory.

Answer Choices:
True
False

Answer: False

 

Question: Neutrophils with defective lysosomes are unable to:
Undergo chemotaxis
Migrate

Answer Choices:
Degrade microorganisms and other foreign material
Attach to microorganisms and other foreign material
Engulf microorganisms and other foreign material

Answer: Degrade microorganisms and other foreign material

 

Question: A broth culture has 2.32 x 10^7 CFU/mL. Approximately how many CFU would you expect to count if you plated 1.0 mL? Please provide WHOLE number, NO EXPONENTS.

Answer: 23200000

 

Question: The type of microscopy in which the field is dark and the specimen is brightly lit, is known as __________-field microscopy.

Answer: Dark

 

Question: Which bacterial species is found on human skin as part of the normal flora?

Answer Choices:
Bacillus subtilis
Escherichia coli
Staphylococcus epidermidis
Enterococcus faecalis

Answer: Staphylococcus epidermidis

 

Question: After incubation of an inoculated Phenol Red Fermentation Broth tube, the test organism was characterized a glucose fermenter since the broth changed from red to [blank].

Answer: yellow

 

Question: After conducting the above experiment, you determined your organism was Gram negative. What experimental observation lead to this determination?

Answer Choices:
Bubble production
No string formation
String formation
Color change

Answer: No string formation

 

Question: The type of microscopy in which the field is bright and the specimen appears opaque, is known as _____________-field microscopy.

Answer: Dark