Portage Microbiology Exam#4
Questions And Correct
Answers
True or False: Growth media is best suited for
distinguishing between two similar species of bacteria -
✔✔✔✔-False. Growth media is designed to simply
support (and not restrict) microbial growth
A researcher is asked to determine which of two vials
contains e coli and which contains salmonella. Knowing
both gram-negative while only one of them is capable of
fermenting lactose, which type of media would be best
suited (multiple choice) - ✔✔✔✔-Differential media
distinguishes between two, often related, microbes
A researcher is asked to determine if a sample contains
Neisseria meningitides. Knowing Neisseria meningitides is
slow growing and other foreign microbes may also be
, present in the culture, which type of media would be best
suited? (multiple choice) - ✔✔✔✔-Selective media
What are the requirements of a fastidious microbe?
(short answer) - ✔✔✔✔-A fastidious microbe is an
organism with complex growth requirements such that is
absent it will not grow. Enriched medias thus contain
these specific and essential nutrients required for the
growth of a particular subset of microorganisms.
True or False: LB agar is classified as a selective, non-
differential media - ✔✔✔✔-False
What is agar used for in microbiology? (short answer) -
✔✔✔✔-Agar is used to create a solid, smooth surface on
which microbes can grow
Alpha hemolysis (matching) - ✔✔✔✔-Incomplete
hemolytic activity
Questions And Correct
Answers
True or False: Growth media is best suited for
distinguishing between two similar species of bacteria -
✔✔✔✔-False. Growth media is designed to simply
support (and not restrict) microbial growth
A researcher is asked to determine which of two vials
contains e coli and which contains salmonella. Knowing
both gram-negative while only one of them is capable of
fermenting lactose, which type of media would be best
suited (multiple choice) - ✔✔✔✔-Differential media
distinguishes between two, often related, microbes
A researcher is asked to determine if a sample contains
Neisseria meningitides. Knowing Neisseria meningitides is
slow growing and other foreign microbes may also be
, present in the culture, which type of media would be best
suited? (multiple choice) - ✔✔✔✔-Selective media
What are the requirements of a fastidious microbe?
(short answer) - ✔✔✔✔-A fastidious microbe is an
organism with complex growth requirements such that is
absent it will not grow. Enriched medias thus contain
these specific and essential nutrients required for the
growth of a particular subset of microorganisms.
True or False: LB agar is classified as a selective, non-
differential media - ✔✔✔✔-False
What is agar used for in microbiology? (short answer) -
✔✔✔✔-Agar is used to create a solid, smooth surface on
which microbes can grow
Alpha hemolysis (matching) - ✔✔✔✔-Incomplete
hemolytic activity
