Portage Microbiology Exam -5 EXAM PRACTICE QUESTIONS Exam
comprehensive questions _ FREQUENTLY MOST TESTED QUESTIONS
AND VERIFIED SOLUTIONS Flashcards _ Quizlet.pdf
Define the concept of universal precautions (short answer) - (ANSWER)Universal precautions means any
and all samples, whether known or unknown, are to be treated as potentially hazardous (or pathogenic)
materials
List at lease 3 observations a researcher would be sure to note while assessing and unknown microbial
sample (short answer) - (ANSWER)Need to note:
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) - (ANSWER)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.
A facultative anaerobe is a microorganism capable of growth under what conditions? (short answer) -
(ANSWER)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 - (ANSWER)False. The Lancefield groups are used to subdivide beta-hemolytic strep
The distinctions for Lancefield subgroups lie in its: (select all that apply)
A. Catalase activity
B. Carbohydrate composition of antigens
, Portage Microbiology Exam -5 EXAM PRACTICE QUESTIONS Exam
comprehensive questions _ FREQUENTLY MOST TESTED QUESTIONS
AND VERIFIED SOLUTIONS Flashcards _ Quizlet.pdf
C. Hemolytic activity
D. All of the above - (ANSWER)B. Carbohydrate composition of antigens
Rheumatic fever displays _____ hemolytic activity and occurs when _____ if left untreated -
(ANSWER)Beta: strep. Pharyngitis
True or False: Under most circumstances, staphylococcus can be found in ~80% of human population
where it remains non-symptomatic - (ANSWER)False. Staphylococcus in only found (non-symptomatic)
in ~30% of the human population
Define commensal bacteria (short answer) (know term and definition first) - (ANSWER)The bacterium
neither harms nor benefits from the host from which it obtains nutrients
How can staphylococcus be differentially tested? (short answer) - (ANSWER)Staphylococcus species are
capable of growth in the presence of bile salts
Symptoms of folliculitis - (ANSWER)Pus-filled lesions on skin or hair
Symptoms of scalded-skin syndrome - (ANSWER)Ruptured-pustules; treated with penicilin
Symptoms of Impetigo - (ANSWER)Childhood skin disease near mouth/nose
Symptoms of conjuctivitis - (ANSWER)Infections of thin, transparent scieral tissue
Symptoms of ophthalmia neonatorum - (ANSWER)Infection occurs at time of birth
comprehensive questions _ FREQUENTLY MOST TESTED QUESTIONS
AND VERIFIED SOLUTIONS Flashcards _ Quizlet.pdf
Define the concept of universal precautions (short answer) - (ANSWER)Universal precautions means any
and all samples, whether known or unknown, are to be treated as potentially hazardous (or pathogenic)
materials
List at lease 3 observations a researcher would be sure to note while assessing and unknown microbial
sample (short answer) - (ANSWER)Need to note:
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) - (ANSWER)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.
A facultative anaerobe is a microorganism capable of growth under what conditions? (short answer) -
(ANSWER)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 - (ANSWER)False. The Lancefield groups are used to subdivide beta-hemolytic strep
The distinctions for Lancefield subgroups lie in its: (select all that apply)
A. Catalase activity
B. Carbohydrate composition of antigens
, Portage Microbiology Exam -5 EXAM PRACTICE QUESTIONS Exam
comprehensive questions _ FREQUENTLY MOST TESTED QUESTIONS
AND VERIFIED SOLUTIONS Flashcards _ Quizlet.pdf
C. Hemolytic activity
D. All of the above - (ANSWER)B. Carbohydrate composition of antigens
Rheumatic fever displays _____ hemolytic activity and occurs when _____ if left untreated -
(ANSWER)Beta: strep. Pharyngitis
True or False: Under most circumstances, staphylococcus can be found in ~80% of human population
where it remains non-symptomatic - (ANSWER)False. Staphylococcus in only found (non-symptomatic)
in ~30% of the human population
Define commensal bacteria (short answer) (know term and definition first) - (ANSWER)The bacterium
neither harms nor benefits from the host from which it obtains nutrients
How can staphylococcus be differentially tested? (short answer) - (ANSWER)Staphylococcus species are
capable of growth in the presence of bile salts
Symptoms of folliculitis - (ANSWER)Pus-filled lesions on skin or hair
Symptoms of scalded-skin syndrome - (ANSWER)Ruptured-pustules; treated with penicilin
Symptoms of Impetigo - (ANSWER)Childhood skin disease near mouth/nose
Symptoms of conjuctivitis - (ANSWER)Infections of thin, transparent scieral tissue
Symptoms of ophthalmia neonatorum - (ANSWER)Infection occurs at time of birth
