BIOD 171: Essential Microbiology
Module 5 Exam Detailed Questions And
Correct Answers Graded A+ 2026-2027.
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 researcher 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 would be determined before
gram status because motility is easily observed on a wet mount. The sample
would need to be killed through heat fixing in order to determine gram status
,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-It would die in the presence of peroxides because
it is unable to breakdown peroxides
streptococcus is most often streaked onto: - ANSWER-blood agar
True or False: the Lancefield groups are used to subdivide antigenic groups of
alpha-hemolytic Streptococcus - ANSWER-False
True or False: the Lancefield groups are used to subdivide antigenic groups of
gamma-hemolytic Streptococcus - ANSWER-false
Greater than 90% of all human streptococcal infections belong to (multiple
choice) - ANSWER-group A
,The distinctions for Lancefield subgroupings lie in its: (select all that apply) -
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 human population where it remains non-symptomatic - ANSWER-
false
True or false: under most circumstances, staphylococcus can be found in
~30% of human population where it remains pathogenic - ANSWER-false
, Define commensal bacteria - ANSWER-Commensal bacteria doesn't harm or
benefit from the host which it gets nutrients
When a bacterium neither harms nor benefits from the host from which it
obtains nutrients, it is referred to as being - ANSWER-Commensal
How can staphylococcus be differentially tested? - ANSWER-In the presence of
Bile salts
pathogen suppresses host immune system so it can continue replicating -
ANSWER-evasion
pathogen passes through or between cells to access deeper tissues and
nutrients - ANSWER-infection
pathogen is passed to another host to restart lifecycle - ANSWER-transmission
Match the following diseases with their respective symptoms:
Module 5 Exam Detailed Questions And
Correct Answers Graded A+ 2026-2027.
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 researcher 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 would be determined before
gram status because motility is easily observed on a wet mount. The sample
would need to be killed through heat fixing in order to determine gram status
,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-It would die in the presence of peroxides because
it is unable to breakdown peroxides
streptococcus is most often streaked onto: - ANSWER-blood agar
True or False: the Lancefield groups are used to subdivide antigenic groups of
alpha-hemolytic Streptococcus - ANSWER-False
True or False: the Lancefield groups are used to subdivide antigenic groups of
gamma-hemolytic Streptococcus - ANSWER-false
Greater than 90% of all human streptococcal infections belong to (multiple
choice) - ANSWER-group A
,The distinctions for Lancefield subgroupings lie in its: (select all that apply) -
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 human population where it remains non-symptomatic - ANSWER-
false
True or false: under most circumstances, staphylococcus can be found in
~30% of human population where it remains pathogenic - ANSWER-false
, Define commensal bacteria - ANSWER-Commensal bacteria doesn't harm or
benefit from the host which it gets nutrients
When a bacterium neither harms nor benefits from the host from which it
obtains nutrients, it is referred to as being - ANSWER-Commensal
How can staphylococcus be differentially tested? - ANSWER-In the presence of
Bile salts
pathogen suppresses host immune system so it can continue replicating -
ANSWER-evasion
pathogen passes through or between cells to access deeper tissues and
nutrients - ANSWER-infection
pathogen is passed to another host to restart lifecycle - ANSWER-transmission
Match the following diseases with their respective symptoms:
