1
module 5 exam - bio171 microbio Questions
with Correct Answers | Updated (100%
Correct Answers)
The concept of treating all samples, whether known or unknown, as
potentially hazardous (or pathogenic) materials is known as _____.
Answer: universal precautions
List at least 3 observations a researchers would be sure to note
while assessing an unknown microbial sample. Answer: size and
shape, motility, gram status, color change, chemical reactions
While observing an unknown sample of limited amounts, a
researcher must determine motility and Gram status using the same
sample. What would you determine first and why? Answer: Motility
because Gram staining requires the sample be fixed which would kill
the organism and then you can't observe motility
a Facultative anaerobe is a microorganism capable of growth under
what conditions? Answer: A microorganism capable of growth
under aerobic and anaerobic conditions
as streptococcus is catalase negative would it thrive or die in the
presence of peroxides? Why? Answer: strep would not survive in
the presence of peroxides b/c it is unable to breakdown peroxides
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, 2
strep is most often streaked onto:
1.) chocolate agar
2.) EMB agar
3.) Blood agar
4.) Spirit blue agar Answer: blood agar
True or false: the Lancefield groups are used to subdivide antigenic
groups of alpha-hemolytic Steptococcus Answer: false
The distinctions for Lancefield groupings lie in its Answer:
Carbohydrate composition of antigens
left untreated, strep throat can progress to___, which displays ___
hemolytic activity. Answer: Rheumatic fever ; beta
Rheumatic fever displays (blank) hemolytic activity and occurs when
(blank) is left untreated Answer: Beta, strep
True or false: under most circumstances, staphylococcus can be
found in ~80% of the human population where it remains non-
symptomatic Answer: false
Define commensal bacteria Answer: It neither harms nor benefits
from the host from which it obtains nutrients
© 2025 All rights reserved
module 5 exam - bio171 microbio Questions
with Correct Answers | Updated (100%
Correct Answers)
The concept of treating all samples, whether known or unknown, as
potentially hazardous (or pathogenic) materials is known as _____.
Answer: universal precautions
List at least 3 observations a researchers would be sure to note
while assessing an unknown microbial sample. Answer: size and
shape, motility, gram status, color change, chemical reactions
While observing an unknown sample of limited amounts, a
researcher must determine motility and Gram status using the same
sample. What would you determine first and why? Answer: Motility
because Gram staining requires the sample be fixed which would kill
the organism and then you can't observe motility
a Facultative anaerobe is a microorganism capable of growth under
what conditions? Answer: A microorganism capable of growth
under aerobic and anaerobic conditions
as streptococcus is catalase negative would it thrive or die in the
presence of peroxides? Why? Answer: strep would not survive in
the presence of peroxides b/c it is unable to breakdown peroxides
© 2025 All rights reserved
, 2
strep is most often streaked onto:
1.) chocolate agar
2.) EMB agar
3.) Blood agar
4.) Spirit blue agar Answer: blood agar
True or false: the Lancefield groups are used to subdivide antigenic
groups of alpha-hemolytic Steptococcus Answer: false
The distinctions for Lancefield groupings lie in its Answer:
Carbohydrate composition of antigens
left untreated, strep throat can progress to___, which displays ___
hemolytic activity. Answer: Rheumatic fever ; beta
Rheumatic fever displays (blank) hemolytic activity and occurs when
(blank) is left untreated Answer: Beta, strep
True or false: under most circumstances, staphylococcus can be
found in ~80% of the human population where it remains non-
symptomatic Answer: false
Define commensal bacteria Answer: It neither harms nor benefits
from the host from which it obtains nutrients
© 2025 All rights reserved
