Portage Learning BIOL 110 microbiology EXAM A+ GRADE ASSURED COMPLETE SOLUTIONS AND VERIFIED ANSWERS

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Exam Solution zm




Portage Microbiology Exam #5 2026 A+ GRADE ASSUR zm zm zm zm zm zm zm




ED COMPLETE SOLUTIONS AND VERIFIED ANSWERS (E
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CA4D)




QUESTION 1 zm




Define the concept of universal precautions (short answer)
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ANSWER

Universal precautions means any and all samples, whether known or unknown, are to be treated as
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potentially hazardous (or pathogenic) materials
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QUESTION 2 zm




List at lease 3 observations a researcher would be sure to note while assessing and u
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nknown microbial sample (short answer)
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ANSWER

Need to note: 1. Size and shape 2. Any observable motility 3. Gram status (positive or negative)
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QUESTION 3 zm




While observing an unknown sample of limited amounts, a researcher must determin
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e the following observations: 1) the presence of any motility and 2) its Gram status us
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ing the same sample-
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the liquid sample cannot be divided. Which would you determine first and why? (sho
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rt answer)
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ANSWER

You must determine motility before determining Gram status. Motility requires a wet mount, while g
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ram staining requires heat fixing the sample. If one were to begin with the gram stain, the heat fixa
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tion process would kill the organism, making any observations regarding motility impossible. The co
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rrect approach would be to place the liquid culture on a glass slide and determine its motility status
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. Next, the same liquid culture can be heat fixed and gram stained.
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, QUESTION 4 zm




A facultative anaerobe is a microorganism capable of growth under what conditions? (
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short answer) zm




ANSWER

A facultative anaerobe is capable of growth under aerobic (with oxygen) and anaerobic (without oxy
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gen) conditions
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QUESTION 5 zm




True or False: The Lancefield groups are used to subdivide antigenic groups of alpha-
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hemolytic Streptococcus zm




ANSWER

False. The Lancefield groups are used to subdivide beta-hemolytic strep
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QUESTION 6 zm




The distinctions for Lancefield subgroups lie in its: (select all that apply)
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A. Catalase activity
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B. Carbohydrate composition of antigens
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C. Hemolytic activity
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D. All of the above
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ANSWER

B. Carbohydrate composition of antigens
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QUESTION 7 zm




Rheumatic fever displays _____ hemolytic activity and occurs when _____ if left untreated
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ANSWER

Beta: strep. Pharyngitis
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QUESTION 8 zm




True or False: Under most circumstances, staphylococcus can be found in ~80% of hu
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man population where it remains non-symptomatic
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ANSWER

False. Staphylococcus in only found (non-symptomatic) in ~30% of the human population
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