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EXAM 3
Name: ___________________________
Multiple choice (3 pts each) (30 points total)
Circle the (one) best answer for each of the 10 questions below.
1) The causative agent of TSEs (transmissible spongiform encephalopathies) is likely
a) A virus.
b) A bacterium.
c) A prion.
d) A protist.
2) Malaria is caused by
a) The protozoan Plasmodium.
b) The bacterium Plasmodium.
c) The fungi Plasmodium.
d) The mosquito Plasmodium.
3) Borrelia burgdorferi
a) Is a spirochete.
b) Causes Lyme disease.
c) Is motile.
d) All of the above.
4) Syphilis is contracted through
a) The air.
b) Direct contact.
c) Contact with feces.
d) A mechanical vector.
5) E. coli 0157:H7
a) Does not contain the Shiga toxin.
b) May cause HUS (hemolytic uremic syndrome)
c) Attacks cells in the lungs.
d) All of the above.
6) Mycobacterium tuberculosis is difficult to treat because it can survive inside white blood cells.
Because of this, we say that these organisms are practicing
a) Chromosomal resistance.
b) Extrachromosomal resistance.
c) Evasion.
d) Microbial antagonism.
7) The Polio virus can be classified as
a) a DNA virus.
b) a sense virus.
c) An antisense virus.
d) a retrovirus.
8) Fungi belong to the domain
a) Archaea.
b) Bacteria.
c) Eukarya.
d) Fungi.
9) Clamp connections
a) Result from dikaryotic cell’s reproduction.
b) Are found under the hood of your car.
c) Form between viruses and host cells.
d) Describes a tick’s hold on its host.
10) All of the following form cysts except
a) Giardia
b) Entamoeba
c) Plasmodium
d) Balantidium
You must answer this question (10 points)
Compare and contrast the following organisms: Trypanosoma, Trichomonas, Giardia.
Matching (30 pts)
a)
d)
g)
j)
m)
p)
s)
v)
Ectoparasites
Endoparasites
Adsorption
Latency
Biological vector
Mechanical vector
Plasmogamy
Septate
b)
e)
h)
k)
n)
q)
t)
w)
Monophyletic
Polyphyletic
Penetration
Definitive host
Broad spectrum
Narrow spectrum
Karyogamy
Aseptate
c)
f)
i)
l)
o)
r)
u)
x)
Strain
Biological species
Provirus
Intermediate host
Capsid
Therapeutic dosage
Toxic dosage
Genome
1) _____ A taxon with one ancestral line.
2) _____ The amount of a chemotherapeutic agent that is harmful to the host.
3) _____ An antibiotic that is effective against both gram positive and gram negative organisms
4) _____ Fleas, ticks, lice and leeches are all good examples.
5) _____ The process of a virus attaching to a host cell membrane.
6) _____ The protein coat surrounding a viral genome.
7) _____ In fungi, the fusion of cytoplasm (but not the nuclei) of two cells.
8) _____ A tick carrying lime disease bites you and passes the disease to you. The tick is
considered this.
9) _____ Hyphae in which cells are divided partially by cell walls.
10) _____ All descendents from a single bacterial cell.
Answer one of the following 2 questions (10 points)
1) Describe synthesis of the genome for a sense virus.
2) Describe synthesis of the genome for an antisense virus.
Answer one of the following 2 questions (10 points)
1) Describe how you would distinguish a fungal colony from a bacterial colony growing on
agar.
2) Describe how you would distinguish- a fungal species from a bacterial species
microscopically.
Answer one of the following 2 questions (10 points)
1) Discuss why an antimicrobial agent that inhibits cell wall synthesis is toxic to bacteria
and not to the host. Give an example of an antimicrobial agent that acts in this manner.
2) Discuss why an antimicrobial agent that inhibits protein synthesis is toxic to bacteria and
not to the host. Give an example of an antimicrobial agent that acts in this manner.