Attempt History
Attempt Time Score
LATEST Attempt 1 36 minutes 98 out of 100
Score for this quiz: 98 out of 100
Submitted Apr 21 at 9:47pm
This attempt took 36 minutes.
Question 1 pts
True or False: Differential media is best suited for distinguishing between
two similar species of bacteria.
Co
orrrec
ct! 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).
False
Question 4 pts
1/13
, 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?
Growth media
Selective media
Co
orrrec
ct! Differential media
Non-selective and non-differential media
Question 3 pts
What are the requirements of a fastidious microbe?
Your Answer:
A fastidious microbe is an organism with complex growth requirement
such that if absent will not grow; hence enriched media contains these
specific and essential nutrients for the growth of particular subset of
microorganisims.
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.
Question 4 pts
2/13
, True or False: LB agar is classified as a selective, non-differential media.
True
Co
orrrec
ct! False
LB agar is the most basic type of agar and like LB media supports
the growth of virtually all microbes without restriction.
Question 5 pts
What is agar used for in microbiology?
Your Answer:
Agar is used as a soft, smooth surface where microbes can be grown.
Agar is used to create a solid, smooth surface on which
microbes can grow.
Question 6 pts
Blood agar is which type of medium? Select all that apply.
Co
orrrec
ct! Differential
Blood agar can be used to differential between species based on its
hemolytic activity.
3/13
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