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BIOD171 / BIOD 171 Final Exam ( Update 2025 / 2026) Essential Microbiology with Lab Questions & Answers - Portage Learning
Question:
True or False: A Giemsa stain can be used to determine the presence of
pathogenic bacteria.
Answer:
True
Question:
True or False. The purpose of a quadrant streak is to produce individual colonies of bacterial population.
Answer:
True
- / 3
Question:
When performing a quadrant streak, the sample is spread across the plate in such a way to form what?
Answer:
A dilution gradient.
Question:
A dilution gradient is formed when carrying out what generalize plating strategy?
Answer:
Phase-Dilution streak
Question:
In what phase of dilution streak would you expect to find the lowest concentration of bacteria. P2 or P4?
Answer:
P4.
The phases concentration rank from P1 being the highest, then P2, P3, and P4.
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Question:
True or False. When performing a dilution streak a new (or sterilized) loop is not required for each phase as long as the bacterial culture is pure.
Answer:
False
Question:
The number of phases (3 vs. 4) and/or the number of times a loop passes through a previous phase (once vs. multiple) is acceptable provided what happens?
Answer:
The resulting gradient has growth of the individual colonies in it
Question:
True or False. To restrict the growth of a pathogenic microbe a researcher might decrease an incubator from 37°C to 25°C.
Answer:
True
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