Portage Learning BIOD 171 FINAL EXAM latest
FINAL EXAM
1. The number of phases (3 vs. 4) and/or the number of times a loop passes through a previous
phase (once vs. multiple times) is acceptable provided what happens?
Either deviation is acceptable in practice provided the resulting gradient contains within it
the growth of individual colonies—if not, the experiment must be repeated.
2. True or False. Pathogenic strains of bacteria tend to grow slower than normal non-pathogenic
bacterial strains.
False. Pathogenic strains of bacteria tend to grow faster than non-pathogenic strains at 37°C,
which is why researchers may set incubators at 25°C to restrict its growth.
1. Folliculitis
D A. Childhood skin disease near mouth/nose
2. Scalded-skin syndrome
E B. Infection of thin, transparent scleral tissue
3. Impetigo
A C. Infection occurs at time of birth
4. Conjunctivitis
B D. Pus-filled lesions on skin or hair
5. Ophthalmia Neonatorum
C E. Ruptured pustules; treated with Penicillin
, 1. True or False. Although there is no cure for tetanus, it can be prevented through vaccination
True. There is no cure for tetanus. However, tetanus is entirely preventable through
vaccination.
2. Describe the symptoms and treatment regimen for someone infected with Clostridium perfringens.
Clostridium perfringens (also known as Gas gangrene) presents with muscle necrosis,
swelling of infected areas, fever and intense gas production. Treatment entails removal of all
infected tissue, often resulting in amputation of the affected areas, in conjunction with heavy
antibiotic therapies.
3. Why does the alpha toxin (perfringolysin) produced during an infection of gas gangrene cause cell
death?
The toxin perforates the membrane. It forms pores in the plasma membrane of host cells
resulting in uncontrolled ion fluxes and eventually cell lysis and death.
1. The surrounds the capsid of some viruses.
Envelope.
2. True or False. You would expect to see a viral envelope on a virus infecting a plant cell.
False. The overwhelming majority of animal viruses are enveloped whereas the majority of
plant or bacteria-infecting viruses are not.
3. Rank the following viruses based on their size from largest to smallest:
Orthomyxovirus
Poliovirus
Variolavirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
FINAL EXAM
1. The number of phases (3 vs. 4) and/or the number of times a loop passes through a previous
phase (once vs. multiple times) is acceptable provided what happens?
Either deviation is acceptable in practice provided the resulting gradient contains within it
the growth of individual colonies—if not, the experiment must be repeated.
2. True or False. Pathogenic strains of bacteria tend to grow slower than normal non-pathogenic
bacterial strains.
False. Pathogenic strains of bacteria tend to grow faster than non-pathogenic strains at 37°C,
which is why researchers may set incubators at 25°C to restrict its growth.
1. Folliculitis
D A. Childhood skin disease near mouth/nose
2. Scalded-skin syndrome
E B. Infection of thin, transparent scleral tissue
3. Impetigo
A C. Infection occurs at time of birth
4. Conjunctivitis
B D. Pus-filled lesions on skin or hair
5. Ophthalmia Neonatorum
C E. Ruptured pustules; treated with Penicillin
, 1. True or False. Although there is no cure for tetanus, it can be prevented through vaccination
True. There is no cure for tetanus. However, tetanus is entirely preventable through
vaccination.
2. Describe the symptoms and treatment regimen for someone infected with Clostridium perfringens.
Clostridium perfringens (also known as Gas gangrene) presents with muscle necrosis,
swelling of infected areas, fever and intense gas production. Treatment entails removal of all
infected tissue, often resulting in amputation of the affected areas, in conjunction with heavy
antibiotic therapies.
3. Why does the alpha toxin (perfringolysin) produced during an infection of gas gangrene cause cell
death?
The toxin perforates the membrane. It forms pores in the plasma membrane of host cells
resulting in uncontrolled ion fluxes and eventually cell lysis and death.
1. The surrounds the capsid of some viruses.
Envelope.
2. True or False. You would expect to see a viral envelope on a virus infecting a plant cell.
False. The overwhelming majority of animal viruses are enveloped whereas the majority of
plant or bacteria-infecting viruses are not.
3. Rank the following viruses based on their size from largest to smallest:
Orthomyxovirus
Poliovirus
Variolavirus
Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm)
