Question 1
3 / 3 pts
The concept of treating all samples, whether known or unknown, as potentially
hazardous (or pathogenic) materials is known as __________.
Your Answer:
universal precautions
Universal precautio
...
Question 1
3 / 3 pts
The concept of treating all samples, whether known or unknown, as potentially
hazardous (or pathogenic) materials is known as __________.
Your Answer:
universal precautions
Universal precautions
Question 2
3 / 3 pts
List at least 3 observations a researcher would be sure to note while assessing an
unknown microbial sample.
Your Answer:
1. any motility
2.size/shape
3. gram status (gram-positive or gram-negative)
4. presense of any chemical reactions
5. changes in color
A lab researcher would be certain to note:
1. Size and shape
2. Any observable motility
3. Gram status (positive or negative)
4. The presence of any chemical reactions
5. Changes in color localized to the organism or the surrounding
media
6. Capture (or draw) images of any of the characteristics described
above
Question 3
10 / 10 pts
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?
Your Answer:
You would need to determine the motility before gram status. You can observe motility
on a wet mount and then heat fix your sample to gram stain your sample. If you were to
begin with using gram staining, you would kill your sample with heat fixing, you would
not be able to observe any motility.
You must determine motility before determining the Gram status. Motility requires
a wet mount, while Gram staining requires heat fixing the sample. If one were to
begin with the Gram stain the heat fixation process would kill the organism,
making any observations regarding motility impossible. The correct approach
would be to place the liquid culture on a glass slide and determine its motility
status. Next, the same liquid culture can be heat fixed and Gram stained.
Question 4
3 / 3 pts
A facultative anaerobe is a microorganism capable of growth under what conditions?
Your Answer:
aerobic and anaerobic conditions
A facultative anaerobe is capable of growth under aerobic (with oxygen) and
anaerobic (without oxygen) con
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