PORTAGE LEARNING EXAM vc vc
Exam Solution vc
Portage Learning: Microbiology Module 5 Portage Micr vc vc vc vc vc vc
obiology BIOD171 Exam 5 Portage Microbiology Exam # vc vc vc vc vc vc vc
5 2026 A+ GRADE ASSURED COMPLETE SOLUTIONS AN
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D VERIFIED ANSWERS (2EDE3)
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QUESTION 1 vc
Define the concept of universal precautions.
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ANSWER
Universal precautions means any and all samples, whether known or unknown, are to be treated as pot
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entially hazardous (or pathogenic) materials.
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QUESTION 2 vc
What would a researcher be certain to note while analyzing a microbial sample?
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ANSWER
1. Size and shape 2. Any observable motility 3. Gram status (positive or negative) 4. The presence of any
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chemical reactions 5. Changes in color localized to the organism or the surrounding media 6. Capture (
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or draw) images of any of the characteristics described above
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QUESTION 3 vc
Which non- vc
selective yet differential agar plate should be used if a Streptococcus sample is suspected
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?
ANSWER
A BAP (blood agar plate) would be the quickest way to identify and classify a potential streptococcus mi
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crobe based on its hemolytic properties.
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QUESTION 4 vc
,What disease can result if a patient with streptococcal pharyngitis goes untreated?
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ANSWER
Rheumatic fever occurs in approximately 3% of untreated cases of streptococcal pharyngitis, presenting
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approximately 2-3 weeks post-infection.
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QUESTION 5 vc
Streptococcus,
E. coli, pseudomonas, and klebsiella are all capable of causing what disease?
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ANSWER
All of the above foreign microbes are capable of causing septicemia, also known as blood poisoning.
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QUESTION 6 vc
What is a facultative anaerobe?vc vc vc vc
ANSWER
A facultative anaerobe is capable of growth under both aerobic (with oxygen) and anaerobic (in the abs
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ence of oxygen) condition.
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QUESTION 7 vc
How can Staphylococcus be differentially tested?
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ANSWER
Staphylococcus species are capable of growth in the presence of bile salts. vc vc vc vc vc vc vc vc vc vc vc
QUESTION 8 vc
A bacterial swab is taken from a patient with impetigo and streaked across an MSA plate.
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Following incubation at 37C, what will be the color of the agar?
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ANSWER
The causative agent of impetigo is staph aureus, a Gram-
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positive bacterium capable of fermenting mannitol. Fermentation will lower the pH of the agar and chan
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ge the dye color from red to yellow.
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QUESTION 9 vc
If a patient were suspected to have tuberculosis (TB), which differential stain would you
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select and why? vc vc
, ANSWER
To stain for TB, one would utilize an acid-
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fast stain to best visual the foreign microbe. As a mycobacterium tuberculosis would stain poorly (indet
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erminate) using the Gram stain. vc vc vc vc
QUESTION 10 vc
According to the module, which mycobacterium infection will be treated free of charge b
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y the World Health Organization (WHO)?
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ANSWER
Leprosy is completely curable using a multiple-
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drug therapy regimen consisting of various combinations of the drugs dapsone, rifampin and clofazimin
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e—all of which is given free of charge.
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QUESTION 11 vc
What are the three main conditions caused by the botulism toxin?
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ANSWER
Foodborne, infant and wound. Foodborne botulism is often the result of improperly canned, contaminat
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ed, low- vc
acidic foods such as green beans, corn and beats. Infant botulism occurs when children, usually under th
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e age of 6 months consume foods containing the bacteria. A potential source of infant botulism is honey
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(which is why pediatricians recommend avoiding feeding honey to infants) but can also be found in com
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mon places such as soil. Wound botulism occurs when
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C. botulinum bacteria colonize a deep wound, often a puncture such as those who inject street drugs suc
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h as heroine. As contaminated needles are injected through the skin, spores enter the body and, in the a
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bsence of oxygen, release the toxin.
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QUESTION 12 vc
Why are infants (< 6 months) more susceptible to botulism?
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ANSWER
Due to infants still maturing intestinal tract and lack of an adult microbiota, the bacteria are able to colo
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nize and produce the associated toxin. In adults, only the direct ingestion of the pre-
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formed toxin causes disease—ingestion of
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C. botulinum or the associated spores do not cause illness as a mature intestinal microbiota sufficiently
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prevents bacterial germination and growth. vc vc vc vc
QUESTION 13 vc
What is the mechanism of action of the toxin produced by clostridium tentani (tetanus)?
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Exam Solution vc
Portage Learning: Microbiology Module 5 Portage Micr vc vc vc vc vc vc
obiology BIOD171 Exam 5 Portage Microbiology Exam # vc vc vc vc vc vc vc
5 2026 A+ GRADE ASSURED COMPLETE SOLUTIONS AN
vc vc vc vc vc vc vc
D VERIFIED ANSWERS (2EDE3)
vc vc vc
QUESTION 1 vc
Define the concept of universal precautions.
vc vc vc vc vc
ANSWER
Universal precautions means any and all samples, whether known or unknown, are to be treated as pot
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
entially hazardous (or pathogenic) materials.
vc vc vc vc
QUESTION 2 vc
What would a researcher be certain to note while analyzing a microbial sample?
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ANSWER
1. Size and shape 2. Any observable motility 3. Gram status (positive or negative) 4. The presence of any
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chemical reactions 5. Changes in color localized to the organism or the surrounding media 6. Capture (
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
or draw) images of any of the characteristics described above
vc vc vc vc vc vc vc vc vc
QUESTION 3 vc
Which non- vc
selective yet differential agar plate should be used if a Streptococcus sample is suspected
vc vc vc vc vc vc vc vc vc vc vc vc vc
?
ANSWER
A BAP (blood agar plate) would be the quickest way to identify and classify a potential streptococcus mi
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
crobe based on its hemolytic properties.
vc vc vc vc vc
QUESTION 4 vc
,What disease can result if a patient with streptococcal pharyngitis goes untreated?
vc vc vc vc vc vc vc vc vc vc vc
ANSWER
Rheumatic fever occurs in approximately 3% of untreated cases of streptococcal pharyngitis, presenting
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approximately 2-3 weeks post-infection.
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QUESTION 5 vc
Streptococcus,
E. coli, pseudomonas, and klebsiella are all capable of causing what disease?
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ANSWER
All of the above foreign microbes are capable of causing septicemia, also known as blood poisoning.
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
QUESTION 6 vc
What is a facultative anaerobe?vc vc vc vc
ANSWER
A facultative anaerobe is capable of growth under both aerobic (with oxygen) and anaerobic (in the abs
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ence of oxygen) condition.
vc vc vc
QUESTION 7 vc
How can Staphylococcus be differentially tested?
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ANSWER
Staphylococcus species are capable of growth in the presence of bile salts. vc vc vc vc vc vc vc vc vc vc vc
QUESTION 8 vc
A bacterial swab is taken from a patient with impetigo and streaked across an MSA plate.
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Following incubation at 37C, what will be the color of the agar?
vc vc vc vc vc vc vc vc vc vc vc vc
ANSWER
The causative agent of impetigo is staph aureus, a Gram-
vc vc vc vc vc vc vc vc vc
positive bacterium capable of fermenting mannitol. Fermentation will lower the pH of the agar and chan
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
ge the dye color from red to yellow.
vc vc vc vc vc vc vc
QUESTION 9 vc
If a patient were suspected to have tuberculosis (TB), which differential stain would you
vc vc vc vc vc vc vc vc vc vc vc vc vc vc
select and why? vc vc
, ANSWER
To stain for TB, one would utilize an acid-
vc vc vc vc vc vc vc vc
fast stain to best visual the foreign microbe. As a mycobacterium tuberculosis would stain poorly (indet
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
erminate) using the Gram stain. vc vc vc vc
QUESTION 10 vc
According to the module, which mycobacterium infection will be treated free of charge b
vc vc vc vc vc vc vc vc vc vc vc vc vc
y the World Health Organization (WHO)?
vc vc vc vc vc
ANSWER
Leprosy is completely curable using a multiple-
vc vc vc vc vc vc
drug therapy regimen consisting of various combinations of the drugs dapsone, rifampin and clofazimin
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e—all of which is given free of charge.
vc vc vc vc vc vc vc
QUESTION 11 vc
What are the three main conditions caused by the botulism toxin?
vc vc vc vc vc vc vc vc vc vc
ANSWER
Foodborne, infant and wound. Foodborne botulism is often the result of improperly canned, contaminat
vc vc vc vc vc vc vc vc vc vc vc vc vc
ed, low- vc
acidic foods such as green beans, corn and beats. Infant botulism occurs when children, usually under th
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
e age of 6 months consume foods containing the bacteria. A potential source of infant botulism is honey
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(which is why pediatricians recommend avoiding feeding honey to infants) but can also be found in com
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mon places such as soil. Wound botulism occurs when
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C. botulinum bacteria colonize a deep wound, often a puncture such as those who inject street drugs suc
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h as heroine. As contaminated needles are injected through the skin, spores enter the body and, in the a
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bsence of oxygen, release the toxin.
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QUESTION 12 vc
Why are infants (< 6 months) more susceptible to botulism?
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ANSWER
Due to infants still maturing intestinal tract and lack of an adult microbiota, the bacteria are able to colo
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nize and produce the associated toxin. In adults, only the direct ingestion of the pre-
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formed toxin causes disease—ingestion of
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C. botulinum or the associated spores do not cause illness as a mature intestinal microbiota sufficiently
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prevents bacterial germination and growth. vc vc vc vc
QUESTION 13 vc
What is the mechanism of action of the toxin produced by clostridium tentani (tetanus)?
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