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 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:
Determining the presence of motility would be my first step, before
determining its Gram status. This is because motility requires the mount
to be wet, while Gram status requires the sample to be heat fixing. If one
choses to begin with the Gram status, the process would destroy the
organism, therefore ruining any chances of accurately determining the
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 pts
A facultative anaerobe is a microorganism capable of growth under what
conditions?
Your Answer:
It is capable of growth both in the presence or absence of oxygen
A facultative anaerobe is capable of growth under aerobic
(with oxygen) and anaerobic (without oxygen) conditions.
Question 5 pts
As Streptococcus is catalase negative would it thrive or die in the
presence of peroxides? Why?
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