1|Page
BIOD 171 Essential Microbiology Module 5 Exam-
with 100% verified solutions 2025
The concept of treating all samples, whether known or unknown, as potentially
hazardous (or pathogenic) materials is known as _____. - (answers)universal
precautions
List at least 3 observations a researchers would be sure to note while assessing an
unknown microbial sample. - (answers)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? - (answers)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? - (answers)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? - (answers)strep would not survive in the presence of peroxides
b/c it is unable to breakdown peroxides
strep is most often streaked onto:
1.) chocolate agar
, 2|Page
2.) EMB agar
3.) Blood agar
4.) Spirit blue agar - (answers)blood agar
True or false: the Lancefield groups are used to subdivide antigenic groups of
alpha-hemolytic Steptococcus - (answers)false
The distinctions for Lancefield groupings lie in its - (answers)Carbohydrate
composition of antigens
left untreated, strep throat can progress to___, which displays ___ hemolytic
activity. - (answers)Rheumatic fever ; beta
Rheumatic fever displays (blank) hemolytic activity and occurs when (blank) is left
untreated - (answers)Beta, strep
True or false: under most circumstances, staphylococcus can be found in ~80% of
the human population where it remains non-symptomatic - (answers)false
Define commensal bacteria - (answers)It neither harms nor benefits from the host
from which it obtains nutrients
pathogen suppresses host immune system so it can continue replicating -
(answers)evasion
BIOD 171 Essential Microbiology Module 5 Exam-
with 100% verified solutions 2025
The concept of treating all samples, whether known or unknown, as potentially
hazardous (or pathogenic) materials is known as _____. - (answers)universal
precautions
List at least 3 observations a researchers would be sure to note while assessing an
unknown microbial sample. - (answers)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? - (answers)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? - (answers)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? - (answers)strep would not survive in the presence of peroxides
b/c it is unable to breakdown peroxides
strep is most often streaked onto:
1.) chocolate agar
, 2|Page
2.) EMB agar
3.) Blood agar
4.) Spirit blue agar - (answers)blood agar
True or false: the Lancefield groups are used to subdivide antigenic groups of
alpha-hemolytic Steptococcus - (answers)false
The distinctions for Lancefield groupings lie in its - (answers)Carbohydrate
composition of antigens
left untreated, strep throat can progress to___, which displays ___ hemolytic
activity. - (answers)Rheumatic fever ; beta
Rheumatic fever displays (blank) hemolytic activity and occurs when (blank) is left
untreated - (answers)Beta, strep
True or false: under most circumstances, staphylococcus can be found in ~80% of
the human population where it remains non-symptomatic - (answers)false
Define commensal bacteria - (answers)It neither harms nor benefits from the host
from which it obtains nutrients
pathogen suppresses host immune system so it can continue replicating -
(answers)evasion
