- Which of the following objects, if touched to the surface oftrypticase soy agar (TSA) within a Petri plate, would likelyexhibit bacterial growth?
A. Your best friends nose
B. A strangers cell phone
C. A sterile swab
D. All of the above
E. A and B
  6. Which of the following is/are true of aseptictechnique during streak plating?
A. It prevents airborne contaminants from entering the test tubeculture you are working with.
B. It prevents airborne contaminants from entering the Petriplate.
C. It prevents cells from your culture from being left on theloop (to be touched by you or someone else the next time the loopis used).
D. All of the above
E. B and C
11. The primary function of the simple stain using methyleneblue is to…
- Distinguish between Gram-positive and Gram-negative wall andmembrane(s) composition and organization.
- Elucidate the shape of a bacterial capsule.
- Elucidate the shape of the cell itself.
- A and B
- B and C
13. If safranin was replaced with methylene blue in the Gramstain, then Gram-negative E. coli would appear?
A. Bluish-Purple
B. Green
C. Pink
D. Red
E. Yellow
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