M4: Module 4 Exam - Requires Respondus LockDown
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Due No due date Points 100 Questions 24 Time Limit 60 Minutes
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Attempt History
Attempt Time Score
LATEST Attempt 1 51 minutes 100 out of 100
Score for this quiz: 100 out of 100
Submitted Jun 6 at 8:10pm
This attempt took 51 minutes.
Question 1 pts
True or False: Differential media is best suited for distinguishing between
two similar species of bacteria.
Correct! True
Growth media does not contain restrictive factors, while selective
media is best used to encourage the growth of one microbe while
simultaneously discouraging the growth of the other. Since two
similar species of microbes are being studied they must be
differentiated under similar but just slightly different conditions
(differential media).
A researcher is asked to determine which of two vials contains E coli and
which contains salmonella. Knowing both are Gram-negative while only
one of them is capable of fermenting lactose, which type of media would
be best suited?
Correct! Differential media
Growth media
Non-selective and non-differential media
Selective media
Question 3 pts
What are the requirements of a fastidious microbe?
Your Answer:
They are organisms with abstract growth requirements and without these
requirements, they are not able to grow. Medias that are rich however,
contain these specific nutrients, which are essential and necessary for the
growth of a certain subset of microorganisms.
A fastidious microbe is an organism with complex growth
requirements such that if absent it will not grow. Enriched
medias thus contain these specific and essential nutrients
required for the growth of a particular subset of
microorganisms.
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