For Expert help and assignment handling,
1
Portage Microbiology Exam #5 Questions and
Answers (100% Correct Answers) Already
Graded A+
Define the concept of universal precautions (short answer) Ans: Universal
precautions means any and all samples, whether known or unknown,
are to be treated as potentially hazardous (or pathogenic) materials
© 2026 Assignment Expert
List at lease 3 observations a researcher would be sure to note while
assessing and unknown microbial sample (short answer) Ans: Need to
note:
Guru01 - Stuvia
1. Size and shape
2. Any observable motility
3. Gram status (positive or negative)
While observing an unknown sample of limited amounts, a researcher
must determine the following observations: 1) the presence of any
motility and 2) its Gram status using the same sample- the liquid sample
cannot be divided. Which would you determine first and why? (short
answer) Ans: You must determine motility before determining Gram
status. Motility requires a wet mount, while gram staining requires heat
fixing the sample. If one were to begin with the gram stain, the heat
fixation process would kill the organism, making any observations
regarding motility impossible. The correct approach would be to place
the liquid culture on a glass slide and determine its motility status. Next,
the same liquid culture can be heat fixed and gram stained.
, For Expert help and assignment handling,
2
A facultative anaerobe is a microorganism capable of growth under
what conditions? (short answer) Ans: A facultative anaerobe is capable
of growth under aerobic (with oxygen) and anaerobic (without oxygen)
conditions
True or False: The Lancefield groups are used to subdivide antigenic
groups of alpha-hemolytic Streptococcus Ans: False. The Lancefield
groups are used to subdivide beta-hemolytic strep
The distinctions for Lancefield subgroups lie in its: (select all that apply)
© 2026 Assignment Expert
A. Catalase activity
Guru01 - Stuvia
B. Carbohydrate composition of antigens
C. Hemolytic activity
D. All of the above Ans: B. Carbohydrate composition of antigens
Rheumatic fever displays _____ hemolytic activity and occurs when _____
if left untreated Ans: Beta: strep. Pharyngitis
True or False: Under most circumstances, staphylococcus can be found
in ~80% of human population where it remains non-symptomatic Ans:
False. Staphylococcus in only found (non-symptomatic) in ~30% of the
human population
Define commensal bacteria (short answer) (know term and definition
first) Ans: The bacterium neither harms nor benefits from the host from
which it obtains nutrients
1
Portage Microbiology Exam #5 Questions and
Answers (100% Correct Answers) Already
Graded A+
Define the concept of universal precautions (short answer) Ans: Universal
precautions means any and all samples, whether known or unknown,
are to be treated as potentially hazardous (or pathogenic) materials
© 2026 Assignment Expert
List at lease 3 observations a researcher would be sure to note while
assessing and unknown microbial sample (short answer) Ans: Need to
note:
Guru01 - Stuvia
1. Size and shape
2. Any observable motility
3. Gram status (positive or negative)
While observing an unknown sample of limited amounts, a researcher
must determine the following observations: 1) the presence of any
motility and 2) its Gram status using the same sample- the liquid sample
cannot be divided. Which would you determine first and why? (short
answer) Ans: You must determine motility before determining Gram
status. Motility requires a wet mount, while gram staining requires heat
fixing the sample. If one were to begin with the gram stain, the heat
fixation process would kill the organism, making any observations
regarding motility impossible. The correct approach would be to place
the liquid culture on a glass slide and determine its motility status. Next,
the same liquid culture can be heat fixed and gram stained.
, For Expert help and assignment handling,
2
A facultative anaerobe is a microorganism capable of growth under
what conditions? (short answer) Ans: A facultative anaerobe is capable
of growth under aerobic (with oxygen) and anaerobic (without oxygen)
conditions
True or False: The Lancefield groups are used to subdivide antigenic
groups of alpha-hemolytic Streptococcus Ans: False. The Lancefield
groups are used to subdivide beta-hemolytic strep
The distinctions for Lancefield subgroups lie in its: (select all that apply)
© 2026 Assignment Expert
A. Catalase activity
Guru01 - Stuvia
B. Carbohydrate composition of antigens
C. Hemolytic activity
D. All of the above Ans: B. Carbohydrate composition of antigens
Rheumatic fever displays _____ hemolytic activity and occurs when _____
if left untreated Ans: Beta: strep. Pharyngitis
True or False: Under most circumstances, staphylococcus can be found
in ~80% of human population where it remains non-symptomatic Ans:
False. Staphylococcus in only found (non-symptomatic) in ~30% of the
human population
Define commensal bacteria (short answer) (know term and definition
first) Ans: The bacterium neither harms nor benefits from the host from
which it obtains nutrients
