Exam Questions and Correct
Answers | New Update
Define the concept of universal precautions. - ANSWER ✔✔Universal
precautions means any and all samples, whether known or unknown, are
to be treated as potentially hazardous (or pathogenic) materials.
List at least 3 observations a researcher would be sure to note while
assessing an unknown microbial sample. - ANSWER ✔✔1. size and
shape
2. gram status
, 3. any observable motility
While observing an unknown sample of limited amounts, a researcher
must determine the following observations: (1) the presence of any
motility and (2) its Gram status using the same sample—the liquid
sample cannot be divided. Which would you determine first and why? -
ANSWER ✔✔You would need to determine the motility first and then
the Gram status. Motility requires a wet mount and Gram staining
requires heat fixing the sample. If you perform a Gram stain first the heat
fixation would kill the organism, making it impossible to observe motility.
A facultative anaerobe is a microorganism capable of growth under what
conditions? - ANSWER ✔✔It is capable of growth under both
anaerobic and aerobic conditions
As Streptococcus is catalase negative would it thrive or die in the
presence of peroxides? Why? - ANSWER ✔✔It would die. Because it is
catalase negative it wouldn't be able to breakdown peroxides.
Streptococcus is most often streaked onto:
- Chocolate agar