Biology 250 Microbiology
Stavney Sp99
Name
Lecture Exam III
40 points total. Use Scantron form 882-ES and the provided space for the essay questions.
1. What type of structure do the common bacteriophages T4 and  have?
a. enveloped
b. complex
c. polyhedral
d. helical
e. multifaceted biplanar
2. Prions are protein particles that can cause disease. An example of a prion caused
disease would be:
a. the common cold
b. ebola
c. Mad Cow Disease or Creutzfeld-Jacob Disease
d. hepatitis
e. shingles
3. A virus that typically infects a human nerve cell can probably also infect:
a. a bacterium
b. a plant root cell
c. a roundworm body cell
d. a yeast cell
e. none of these answers are correct
4. In the bacteriophage lytic cycle, the next step after penetration is:
a. integration into the chromosome
b. copying RNA into DNA
c. assembling completed virus particles
d. breaking out of the cell
e. biosynthesis
5. Which disease is correctly matched with its pathogen?
a. giardia: an apicomplexan protozoan
b. pinworm: a flatworm
c. Aspergillus: a yeast
d. influenza: an RNA virus
e. histoplasmosis: a dinoflagellate
--------------------------------------------------------------------------------------------------------------------TRUE/ FALSE (Answer “a” if true, and “b” if false)
6. Viruses cannot reproduce unless they are inside of a living cell.
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Exam III pg 1
7. Some forms of cancer are believed to be caused by viruses.
TRUE/ FALSE, continued.....
8. DNA eukaryotic viruses replicate and assemble in the host cell cytoplasm.
9. Animal viruses usually enter a host cell with the capsid intact, whereas bacteriophages
leave their capsid outside the host cell.
10. Fungi can grow better than bacteria in very low moisture conditions.
--------------------------------------------------------------------------------------------------------------------11. Which virus below carries the enzyme reverse transcriptase?
a. HIV
b. influenza
c. T4
d. rabies
e. hepatitis
12. Yeast belong to which Kingdom?
a. Monera
b. Protista
c. Animalia
d. Plantae
e. Fungi
13. An example of a viral cytopathic effect (CPE) is the formation of
a. inclusion bodies
b. endotoxins
c. capsules
d. prions
e. septate hyphae
14. Fungi are classified mostly on the basis of:
a. shape and gram stain
b. spore types and presence/absence of cell walls
c. unicellularity/multicellularity and type of motility
d. presence/absence of cell walls and type of toxins produced
e. gram stain and unicellularity/multicellularity
15. Which organism is a common cause of nosocomial infection?
a. Candida albicans
b. Pseudomonas aeruginosa
c. Taenia tapeworm
d. Streptococcus pneumoniae
e. Rabdovirus (rabies)
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Exam III pg 2
16. Which picture in the diagrams above most closely matches the complete structure of
the HIV virus that causes AIDS?
a. H
b. I
c. J
d. K
e. none of these is anything like the HIV virus
17. The virus pictured in Drawing J above shows which type of viral shape?
a. helical
b. polyhedral
c. complex
d. enveloped
e. cylindrahedral
-------------------------------------------------------------------------------------------------------------------Match the description on the left with the pathogen or disease on the right. For answers
with multiple letters, like “abd”, fill in “a” AND “b” AND “d” on your answer sheet.
18. An organism that causes newborn “thrush”
and often becomes a systemic infection in
AIDS patients
a. Histoplasma
b. pinworm
c. lung fluke
d. Gonyaulax dinoflagellate
19. A wasting disease caused by Entamoeba
e. Aspergillis
histolytica, characterized by constant diarrhea
ab. Candida albicans
ac. hookworm
20. An intestinal disease caused by an organism
ad. ascaris
with a scolex and numerous proglottid segments
ae. Taenia tapeworm
bc. shistosomiasis
21. An egg-infective helminthic disease where the
bd. amoebic dysentery
organism (Enterobius vermicularis) spends its
be. malaria
entire adult life inside the human intestine.
cd. trichinella
ce. trypanosomiasis
abc. trichomoniasis vaginitis
---------------------------------------------------------------------------------------------------------------------
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Exam III pg 3
22. Microbial antagonism refers to the situation where:
a. two different microbes cause opposite disease effects
b. two microbes synthesize chemicals designed specifically to kill each other
c. invading microbes cannot establish a population because they have to compete
with resident microbes
d. white blood cells chase, attack, and eat invading microbes
e. a person is more likely to develop a disease resistant to an antibiotic
23. Which of the following diseases is spread by vehicle transmission?
a. malaria
b. cold (rhinovirus)
c. rabies
d. cholera
e. AIDS
--------------------------------------------------------------------------------------------------------------------TRUE/FALSE Answer “a” if true and “b” if false
24. The incidence of a disease refers to the total number of people who have the disease
every year.
25. Normal microbiota are benign, friendly bacteria that can grow anywhere on the human
body without causing disease.
26. The incubation period of a disease is the time when the patient feels mild symptoms,
like aches and malaise.
27. An endemic disease occasionally makes someone sick in a population but is not
constantly present.
--------------------------------------------------------------------------------------------------------------------28. Infection by the parental route of infection could occur from:
a. eating fish contaminated with Clostridium botulinum
b. getting bit by a dog with rabies
c. inhaling Aspergillis spores from a dirty humidifier
d. working in an enclosed space with a coughing tuberculosis patient
e. eating undercooked pork or bear meat
29. Parasitic organisms with simple or no digestive systems, a primitive nervous system,
and complex reproductive processes are likely to be:
a. bacteria
b. helminths
c. algae
d. protozoans
e. fungi
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30. The viral DNA that lies dormant in the bacterial chromosome during the lysogenic life
cycle is called a(n):
a. prophage
b. provirus
c. Hfr
d. interferon
e. gene
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Exam III pg 5
Essay Sheet
Name
First, write your name in the blank on this sheet. Then write the first three letters of your last name
AND the test version on the back of this sheet in the blanks provided at the top. Next, complete
ONE of the two essays (question 31 or 32). Be sure to cross out any writing you don’t want graded.
31. 10 pts. Describe Koch’s Postulates in detail. Then discuss how the Postulates show
that microorganisms can cause disease.
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Exam III pg 6
First 3 letters of last name
Test version
32. 10 pts. Name and describe at least two protozoan-caused diseases. Include the name
of the disease, the protozoan name, the group to which the protozoan belongs, how the
disease is transmitted (including any intermediate hosts or cyst stages), and the body
systems affected.
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Exam III pg 7