Bio 246 Exam 2 Practice | Questions & Answers Latest
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1. Describe how the concept of a 'magic bullet' influences the development of new
antibiotics.
The concept of a 'magic bullet' suggests that all antibiotics should be
broad-spectrum to kill as many pathogens as possible.
The concept of a 'magic bullet' influences antibiotic development
by guiding researchers to create drugs that specifically target
bacterial pathogens while minimizing harm to human cells.
The concept of a 'magic bullet' implies that antibiotics should be developed
to target viral infections.
The concept of a 'magic bullet' indicates that antibiotics should be used in
combination to enhance their effectiveness.
2. Endospores produced by some bacteria are:
easily destroyed by heat and chemicals
non-living structures
metabolically inactive
reproductive structures
3. Describe the significance of the lipid bilayer in enveloped viruses
compared to naked viruses.
The lipid bilayer provides structural support and is essential for viral
replication.
The lipid bilayer is a byproduct of viral replication.
The lipid bilayer is responsible for the virus's genetic material.
The lipid bilayer in enveloped viruses helps them evade the host
immune system and facilitates entry into host cells.
,4. Describe the structural features that distinguish bacteriophages from other
types of viruses.
Bacteriophages are simple in structure and lack a capsid.
Bacteriophages have a complex capsid structure with a polyhedral
head and a helical sheath.
Bacteriophages have a spherical shape and are enveloped.
Bacteriophages have a single-stranded RNA genome.
5. What is the primary effect of moist heat on microbial proteins?
Denaturation and coagulation
Hydrolysis and synthesis
Oxidation and reduction
Precipitation and crystallization
6. Describe the significance of the lipid envelope in enveloped viruses
compared to naked viruses.
The lipid envelope helps enveloped viruses evade the host's immune
system and facilitates entry into host cells.
The lipid envelope is responsible for the virus's genetic material.
The lipid envelope provides structural support and is essential for viral
replication.
The lipid envelope allows naked viruses to replicate more efficiently.
7. Describe the importance of nucleic acid synthesis in the life cycle of a virus.
Nucleic acid synthesis helps in the degradation of host cell components.
, Nucleic acid synthesis is involved in the formation of the viral envelope.
Nucleic acid synthesis is crucial for producing copies of the viral
genome, which are needed for assembling new viruses.
Nucleic acid synthesis allows viruses to evade the immune response.
8. If a virus is unable to bud from the host cell membrane, what impact would
this have on its ability to infect other cells?
The virus would become a prion.
The virus would be unable to spread to new host cells.
The virus would increase its virulence.
The virus would replicate faster within the host cell.
9. What is the primary goal of sanitization in microbial control?
Reducing the number of microorganisms on inanimate objects to
acceptable levels.
Increasing the number of microorganisms on surfaces.
Eliminating all microorganisms from surfaces.
Enhancing the growth of beneficial microorganisms.
10. Which of the following relies upon existing biodiversity for the
decontamination of polluted ecosystems?
After centuries of agricultural production, soils depleted of
nitrogen can be replenished by promoting the growth of nitrogen-
fixing organisms.
Sawdust from lumber mills can be used to soak up chemicals that have
saturated natural ecosystems.
, Some types of bacteria naturally convert toxins to less hazardous
forms.
Species in contaminated areas may evolve into forms that can survive
in contaminated soils.
11. Describe the process by which viruses replicate their genome within a host
cell.
Viruses use the host cell's machinery to replicate their genome and
assemble new viral particles.
Viruses replicate their genome through a process similar to binary fission.
Viruses convert their genome into DNA before replication.
Viruses independently replicate their genome without host cell
assistance.
12. Why does microbial diversity necessitate different decontamination
methods?
Microbial diversity has no impact on decontamination strategies.
All microbes can be eliminated using the same method.
Different microbes may require specific methods for effective
elimination.
Decontamination methods are universally effective regardless of
microbial type.
13. What is the function of disinfection?
To kill all living microorganisms
To reduce the number of microorganisms to an acceptable public health
standard
To destroy pathogenic microorganisms or to reduce the growth of
pathogenic microorganisms on an object or a surface
2026/27 Pdf Update | Graded A+
Instant Pdf Download
1. Describe how the concept of a 'magic bullet' influences the development of new
antibiotics.
The concept of a 'magic bullet' suggests that all antibiotics should be
broad-spectrum to kill as many pathogens as possible.
The concept of a 'magic bullet' influences antibiotic development
by guiding researchers to create drugs that specifically target
bacterial pathogens while minimizing harm to human cells.
The concept of a 'magic bullet' implies that antibiotics should be developed
to target viral infections.
The concept of a 'magic bullet' indicates that antibiotics should be used in
combination to enhance their effectiveness.
2. Endospores produced by some bacteria are:
easily destroyed by heat and chemicals
non-living structures
metabolically inactive
reproductive structures
3. Describe the significance of the lipid bilayer in enveloped viruses
compared to naked viruses.
The lipid bilayer provides structural support and is essential for viral
replication.
The lipid bilayer is a byproduct of viral replication.
The lipid bilayer is responsible for the virus's genetic material.
The lipid bilayer in enveloped viruses helps them evade the host
immune system and facilitates entry into host cells.
,4. Describe the structural features that distinguish bacteriophages from other
types of viruses.
Bacteriophages are simple in structure and lack a capsid.
Bacteriophages have a complex capsid structure with a polyhedral
head and a helical sheath.
Bacteriophages have a spherical shape and are enveloped.
Bacteriophages have a single-stranded RNA genome.
5. What is the primary effect of moist heat on microbial proteins?
Denaturation and coagulation
Hydrolysis and synthesis
Oxidation and reduction
Precipitation and crystallization
6. Describe the significance of the lipid envelope in enveloped viruses
compared to naked viruses.
The lipid envelope helps enveloped viruses evade the host's immune
system and facilitates entry into host cells.
The lipid envelope is responsible for the virus's genetic material.
The lipid envelope provides structural support and is essential for viral
replication.
The lipid envelope allows naked viruses to replicate more efficiently.
7. Describe the importance of nucleic acid synthesis in the life cycle of a virus.
Nucleic acid synthesis helps in the degradation of host cell components.
, Nucleic acid synthesis is involved in the formation of the viral envelope.
Nucleic acid synthesis is crucial for producing copies of the viral
genome, which are needed for assembling new viruses.
Nucleic acid synthesis allows viruses to evade the immune response.
8. If a virus is unable to bud from the host cell membrane, what impact would
this have on its ability to infect other cells?
The virus would become a prion.
The virus would be unable to spread to new host cells.
The virus would increase its virulence.
The virus would replicate faster within the host cell.
9. What is the primary goal of sanitization in microbial control?
Reducing the number of microorganisms on inanimate objects to
acceptable levels.
Increasing the number of microorganisms on surfaces.
Eliminating all microorganisms from surfaces.
Enhancing the growth of beneficial microorganisms.
10. Which of the following relies upon existing biodiversity for the
decontamination of polluted ecosystems?
After centuries of agricultural production, soils depleted of
nitrogen can be replenished by promoting the growth of nitrogen-
fixing organisms.
Sawdust from lumber mills can be used to soak up chemicals that have
saturated natural ecosystems.
, Some types of bacteria naturally convert toxins to less hazardous
forms.
Species in contaminated areas may evolve into forms that can survive
in contaminated soils.
11. Describe the process by which viruses replicate their genome within a host
cell.
Viruses use the host cell's machinery to replicate their genome and
assemble new viral particles.
Viruses replicate their genome through a process similar to binary fission.
Viruses convert their genome into DNA before replication.
Viruses independently replicate their genome without host cell
assistance.
12. Why does microbial diversity necessitate different decontamination
methods?
Microbial diversity has no impact on decontamination strategies.
All microbes can be eliminated using the same method.
Different microbes may require specific methods for effective
elimination.
Decontamination methods are universally effective regardless of
microbial type.
13. What is the function of disinfection?
To kill all living microorganisms
To reduce the number of microorganisms to an acceptable public health
standard
To destroy pathogenic microorganisms or to reduce the growth of
pathogenic microorganisms on an object or a surface
