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BIO250_SL_V7 | Topic 12: Microbe-Human Interactions: Health and Disease
Started on Saturday, December 7, 2024, 10:30 PM
State Finished
Completed on Saturday, December 7, 2024, 10:55 PM
Time taken 24 mins 39 secs
Grade 120.00 out of 125.00 (96%)
Question 1
What is the purpose of High-Temperature Short-Time (HTST) pasteurization?
Correct
5.00 points out Select one:
of 5.00 a. To extend the shelf life of food without refrigeration
b. To sterilize food products completely
c. To reduce the number of bacteria in milk while preserving its quality
d. To enhance the taste and smell of pasteurized milk
Question 2
Which halogen is commonly used in dental health to prevent dental caries (cavities)?
Correct
5.00 points out Select one:
of 5.00 a. Chlorine
b. Bromine
c. Iodine
d. Fluorine
Question 3
A researcher is developing a new microbial control protocol for use in a hospital setting. Which
Correct scenario best exemplifies the design and implementation of this protocol?
5.00 points out
of 5.00 Select one:
a. The researcher relies solely on laboratory testing results to determine the effectiveness of the
new protocol, without conducting real-world trials in a hospital environment.
b. The researcher selects a disinfectant agent based solely on its popularity in the industry
without considering its efficacy against common hospital-acquired pathogens.
c. The researcher decides to test the new protocol only on surfaces that are easily accessible,
without considering areas prone to microbial colonization and transmission.
d. The researcher conducts a thorough literature review to understand the factors contributing
to the strengths and limitations of existing microbial control protocols before designing the
new protocol.
,Question 4
What is the key difference between Thermal Death Point (TDP) and Thermal Death Time (TDT)?
Correct
5.00 points out Select one:
of 5.00 a. TDP refers to the lowest temperature at which all microbes are killed, while TDT indicates
the time needed to kill microbes at a specific temperature.
b. TDP and TDT are interchangeable terms describing the same concept of microbial death under
high heat conditions.
c. TDP measures the time required to kill all microbes, whereas TDT determines the lowest
temperature at which all microbes are killed.
d. TDP represents the maximum time needed to achieve sterilization, whereas TDT indicates the
temperature at which all microbes are destroyed.
Question 5
A pharmaceutical company is developing a new vaccine that requires the long-term preservation of
Correct a specific strain of the virus. The company needs to store the virus samples at ultra-low
5.00 points out temperatures of −70 °C or below to maintain their stability and viability for future vaccine
of 5.00 production. Why is it crucial for the pharmaceutical company to store the virus samples at ultra-low
temperatures of −70 °C or below?
Select one:
a. To prevent mutations in the virus genome during storage
b. To maintain the stability and viability of the virus samples over an extended period
c. To accelerate the replication of the virus for vaccine development
d. To facilitate the inactivation of the virus for safer handling
Question 6
Read the following statements and choose the correct statement about different chemical
Correct preservatives.
5.00 points out
Statement I: Peroxygens, such as hydrogen peroxide, are effective against gram-positive bacteria
of 5.00
but not gram-negative bacteria.
Statement II: Glutaraldehyde is commonly used as an antiseptic due to its low skin irritation
potential.
Statement III: Nisin, an antimicrobial peptide, is produced by Streptococcus mutans and is used to
prevent fungal growth in dairy products.
Statement IV: Sorbic acid is commonly used as a preservative in a wide variety of foods, including
dairy, bread, fruit, and vegetable products.
Select one:
a. Statement IV
b. Statement III
c. Statement I
d. Statement II
,Question 7
Match the following pairs.
Incorrect
A B
0.00 points out
i. Biological Safety Level 1 (BSL-1) a. West Nile virus
of 5.00
ii. Biological Safety Level 2 (BSL-2) b. Baculoviruses
iii. Biological Safety Level 3 (BSL-3) c. Measles viruses
iv. Biological Safety Level 4 (BSL-4) d. Marburg virus
Select one:
a. i-b, ii-d, iii-a, iv-c
b. i-d, ii-c, iii-a, iv-b
c. i-b, ii-c, iii-a, iv-d
d. i-b, ii-a, iii-c, iv-d
Question 8
Identify the names of these three compounds used to control microbial growth.
Correct
5.00 points out
of 5.00
Select one:
a. a- Phenol, b- o-phenylphenol, c- Hexachlorophene
b. a-Phenol, b-o-phenylphenol, c- Ethanol
c. a- Cresols, b-o-phenylphenol, c- Hexachlorophene
d. a- Phenol, b- Triclosan, c- Hexachlorophene
Question 9
Which class of antibacterial drugs primarily target the 30S ribosomal subunit and impair the
Correct proofreading ability of bacterial ribosomes?
5.00 points out
of 5.00 Select one:
a. Macrolides
b. Lincosamides
c. Aminoglycosides
d. Chloramphenicol
, Question 10
What aspect of antimicrobial susceptibility testing does the Etest combine?
Correct
5.00 points out Select one:
of 5.00 a. Kirby-Bauer assay and dilution methods
b. Macrobroth dilution and microdilution trays
c. Microdilution trays and agar dilution
d. Kirby-Bauer assay and macrobroth dilution
Question 11
Which statement accurately describes the mode of action of polymyxins?
Correct
5.00 points out Select one:
of 5.00 a. Polymyxins selectively target gram-positive bacteria by disrupting their cell membranes.
b. Polymyxins possess selective toxicity towards bacterial cell membranes, sparing human cells.
c. Polymyxins disrupt both the outer and inner membranes of gram-negative bacteria,
ultimately causing cell death.
d. Polymyxins interact with the peptidoglycan layer of bacterial cell walls to inhibit cell growth.
Question 12
Which statement about isoniazid is false?
Correct
5.00 points out Select one:
of 5.00 a. Isoniazid is typically used alone as monotherapy for tuberculosis treatment.
b. Isoniazid treatment can lead to side effects such as hepatotoxicity, neurotoxicity, and
hematologic toxicity.
c. Isoniazid acts as a prodrug, activated within bacterial cells to inhibit the synthesis of mycolic
acid.
d. Isoniazid is an antimetabolite used in the treatment of tuberculosis.
Question 13
Which statement accurately states the usage of allylamines and triazoles in antifungal therapy?
Correct
I. Allylamines like terbinafine are primarily used for the topical treatment of dermatophytic
5.00 points out
infections.
of 5.00
II. Triazoles such as fluconazole are commonly administered orally or intravenously for systemic
yeast infections.
Select one:
a. Statement I is false, and Statement II is true.
b. Statement I is true, and Statement II is false.
c. Both Statement I and Statement II are false.
d. Both Statement I and Statement II are true.
BIO250_SL_V7 | Topic 12: Microbe-Human Interactions: Health and Disease
Started on Saturday, December 7, 2024, 10:30 PM
State Finished
Completed on Saturday, December 7, 2024, 10:55 PM
Time taken 24 mins 39 secs
Grade 120.00 out of 125.00 (96%)
Question 1
What is the purpose of High-Temperature Short-Time (HTST) pasteurization?
Correct
5.00 points out Select one:
of 5.00 a. To extend the shelf life of food without refrigeration
b. To sterilize food products completely
c. To reduce the number of bacteria in milk while preserving its quality
d. To enhance the taste and smell of pasteurized milk
Question 2
Which halogen is commonly used in dental health to prevent dental caries (cavities)?
Correct
5.00 points out Select one:
of 5.00 a. Chlorine
b. Bromine
c. Iodine
d. Fluorine
Question 3
A researcher is developing a new microbial control protocol for use in a hospital setting. Which
Correct scenario best exemplifies the design and implementation of this protocol?
5.00 points out
of 5.00 Select one:
a. The researcher relies solely on laboratory testing results to determine the effectiveness of the
new protocol, without conducting real-world trials in a hospital environment.
b. The researcher selects a disinfectant agent based solely on its popularity in the industry
without considering its efficacy against common hospital-acquired pathogens.
c. The researcher decides to test the new protocol only on surfaces that are easily accessible,
without considering areas prone to microbial colonization and transmission.
d. The researcher conducts a thorough literature review to understand the factors contributing
to the strengths and limitations of existing microbial control protocols before designing the
new protocol.
,Question 4
What is the key difference between Thermal Death Point (TDP) and Thermal Death Time (TDT)?
Correct
5.00 points out Select one:
of 5.00 a. TDP refers to the lowest temperature at which all microbes are killed, while TDT indicates
the time needed to kill microbes at a specific temperature.
b. TDP and TDT are interchangeable terms describing the same concept of microbial death under
high heat conditions.
c. TDP measures the time required to kill all microbes, whereas TDT determines the lowest
temperature at which all microbes are killed.
d. TDP represents the maximum time needed to achieve sterilization, whereas TDT indicates the
temperature at which all microbes are destroyed.
Question 5
A pharmaceutical company is developing a new vaccine that requires the long-term preservation of
Correct a specific strain of the virus. The company needs to store the virus samples at ultra-low
5.00 points out temperatures of −70 °C or below to maintain their stability and viability for future vaccine
of 5.00 production. Why is it crucial for the pharmaceutical company to store the virus samples at ultra-low
temperatures of −70 °C or below?
Select one:
a. To prevent mutations in the virus genome during storage
b. To maintain the stability and viability of the virus samples over an extended period
c. To accelerate the replication of the virus for vaccine development
d. To facilitate the inactivation of the virus for safer handling
Question 6
Read the following statements and choose the correct statement about different chemical
Correct preservatives.
5.00 points out
Statement I: Peroxygens, such as hydrogen peroxide, are effective against gram-positive bacteria
of 5.00
but not gram-negative bacteria.
Statement II: Glutaraldehyde is commonly used as an antiseptic due to its low skin irritation
potential.
Statement III: Nisin, an antimicrobial peptide, is produced by Streptococcus mutans and is used to
prevent fungal growth in dairy products.
Statement IV: Sorbic acid is commonly used as a preservative in a wide variety of foods, including
dairy, bread, fruit, and vegetable products.
Select one:
a. Statement IV
b. Statement III
c. Statement I
d. Statement II
,Question 7
Match the following pairs.
Incorrect
A B
0.00 points out
i. Biological Safety Level 1 (BSL-1) a. West Nile virus
of 5.00
ii. Biological Safety Level 2 (BSL-2) b. Baculoviruses
iii. Biological Safety Level 3 (BSL-3) c. Measles viruses
iv. Biological Safety Level 4 (BSL-4) d. Marburg virus
Select one:
a. i-b, ii-d, iii-a, iv-c
b. i-d, ii-c, iii-a, iv-b
c. i-b, ii-c, iii-a, iv-d
d. i-b, ii-a, iii-c, iv-d
Question 8
Identify the names of these three compounds used to control microbial growth.
Correct
5.00 points out
of 5.00
Select one:
a. a- Phenol, b- o-phenylphenol, c- Hexachlorophene
b. a-Phenol, b-o-phenylphenol, c- Ethanol
c. a- Cresols, b-o-phenylphenol, c- Hexachlorophene
d. a- Phenol, b- Triclosan, c- Hexachlorophene
Question 9
Which class of antibacterial drugs primarily target the 30S ribosomal subunit and impair the
Correct proofreading ability of bacterial ribosomes?
5.00 points out
of 5.00 Select one:
a. Macrolides
b. Lincosamides
c. Aminoglycosides
d. Chloramphenicol
, Question 10
What aspect of antimicrobial susceptibility testing does the Etest combine?
Correct
5.00 points out Select one:
of 5.00 a. Kirby-Bauer assay and dilution methods
b. Macrobroth dilution and microdilution trays
c. Microdilution trays and agar dilution
d. Kirby-Bauer assay and macrobroth dilution
Question 11
Which statement accurately describes the mode of action of polymyxins?
Correct
5.00 points out Select one:
of 5.00 a. Polymyxins selectively target gram-positive bacteria by disrupting their cell membranes.
b. Polymyxins possess selective toxicity towards bacterial cell membranes, sparing human cells.
c. Polymyxins disrupt both the outer and inner membranes of gram-negative bacteria,
ultimately causing cell death.
d. Polymyxins interact with the peptidoglycan layer of bacterial cell walls to inhibit cell growth.
Question 12
Which statement about isoniazid is false?
Correct
5.00 points out Select one:
of 5.00 a. Isoniazid is typically used alone as monotherapy for tuberculosis treatment.
b. Isoniazid treatment can lead to side effects such as hepatotoxicity, neurotoxicity, and
hematologic toxicity.
c. Isoniazid acts as a prodrug, activated within bacterial cells to inhibit the synthesis of mycolic
acid.
d. Isoniazid is an antimetabolite used in the treatment of tuberculosis.
Question 13
Which statement accurately states the usage of allylamines and triazoles in antifungal therapy?
Correct
I. Allylamines like terbinafine are primarily used for the topical treatment of dermatophytic
5.00 points out
infections.
of 5.00
II. Triazoles such as fluconazole are commonly administered orally or intravenously for systemic
yeast infections.
Select one:
a. Statement I is false, and Statement II is true.
b. Statement I is true, and Statement II is false.
c. Both Statement I and Statement II are false.
d. Both Statement I and Statement II are true.
