Download Spring 2009 - AVC Online

BIOLOGY 204
GENERAL MICROBIOLOGY
INSTRUCTOR: Dr A. Hemsley
ANTELOPE VALLEY COLLEGE
SPRING 2009
THEORY TEST 3
100 POINTS
STUDENT NAME: ___________________________________
STUDENT I.D. NUMBER: _____________________________
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Perusal time = 10 minutes
Test time = 105 minutes
ANSWER ALL QUESTIONS
Read ALL questions carefully during perusal time, you may write if you wish.
Use the back of each sheet if you do not have enough writing space, but please label each
answer.
• Question subheadings are NOT of equal points value.
• Points allocated for each subheading are shown at the end of the question.
GOOD LUCK!
QUESTION 1 (Total =10 points)
Match entries in the left column with answers from the lettered choices in the right column. Write your letter
choice to the far left of each question in the spaces provided. Use each answer only ONCE.
(1 Point per
correct pair)
_____ 1. Protozoan phylum of nonphotosynthetic algae
a.
Dinoflagellates
_____ 2. Photosynthetic protozoa that produce toxins
b.
Mycelium
_____ 3. Protozoan phylum whose members possess pseudopods
c.
Mastigophora
_____ 4. Superkingdom of prokaryotes with no peptidoglycan in cell wall
d.
Mycosis
_____ 5. Protozoan phylum whose members have an apical bag
of digestive enzymes
e.
Bacteria
_____ 6. Hyphal mass, produced under favorable growth conditions
f.
Archaea
_____ 7. Protozoan genus causing African Sleeping Sickness
g.
Amoebozoa
_____8. Fungal Infection
h.
Apicomplexans
_____ 9. Protozoan phylum whose members possess flagellae
i.
Trypanosoma
_____ 10. Superkingdom of prokaryotes with no peptidoglycan in cell wall
j.
Water molds
Page 1
QUESTION 2 (Total =10 points)
A.
Explain the difference between a vegetative and a reproductive mycelium.
(2)
B.
Explain the difference between an ectoparasite and an endoparasite.
(2)
C.
List the four steps of Koch’s postulates.
(4)
D.
Provide 2 commonly encountered disease situations where Koch’s postlates cannot be satisfied, and give a
specific example of the disease and/or pathogen in each case.
(2)
Page 2
QUESTION 3 (Total =20 points)
A.
Discuss three ways in which eukaryotic parasites can cause disease and give an example to illustrate each
point you are discussing.
(6)
B.
Describe 2 applications where fungi have proven useful to humans and 2 examples of their negative
Impact on humans or other species.
(4)
C.
Describe the life cycle of the beef tapeworm and provide its scientific (species) name.
D.
Provide one example of an arthropod which causes/carries disease and give the name of the disease.
(5)
(5)
Page 3
QUESTION 4 (Total =20 points)
A.
Describe the difference between a plus strand and a minus strand virus.
B.
What is the basis for dividing RNA viruses into 2 groups? Provide a detailed answer, it’s worth 6 points!
(6)
C.
Explain the difference between viral host range and viral specificity.
D.
Some viruses are said to be teratogenic. Explain what this term means and give two examples of
teratogenic pathogens.
(4)
(4)
(6)
Page 4
QUESTION 5 (Total =20 points)
Fill in the blanks in the following sentences. (1 point per correct sentence)
1.
A manifestation of disease not readily apparent to an observer is a ____________________.
2.
A manifestation of disease measurable by an observer is a ____________________.
3.
An infection limited to one part of the body is known as a _________________ infection.
4.
An infection that spreads from one area of the body to another is a _____________ infection.
5.
The presence of viruses in the blood is known as __________________________.
6.
Bacteria multiplying in the blood” describes a condition known as _____________________.
7.
The presence of toxins in the blood is known as __________________________.
8.
_____________________ bacteria are prokaryotes with a thick peptidoglycan layer in the cell wall.
9.
Mycoplasmas are prokaryotes with _____________________ cell wall.
10.
____________________________ are protists with plant-like and animal-like properties.
11.
When conditions are unfavorable, some protozoans will form a protective capsule and become a dormant
form known as a ______________________________.
12.
A method used to identify bacteria is ____________________________.
13.
____________________________ is the process of describing all metabolic and anatomical features of
bacteria and establishing their evolutionary relationships with others .
14.
A virus family that causes common colds is ________________________.
15.
The virus family that causes smallpox is________________________.
16.
Genes whose activation can lead to cancer development are known as _____________________ .
17.
An example of a cancer-causing RNA virus is the ____________________________ virus.
18.
One way to culture animal viruses is in ____________________________.
19.
The lipid layer that a virus may pick up as it leaves the host cell is called the _________________ .
20.
A virus family that causes hepatitis is _________________________________.
Page 5
QUESTION 6 (Total =20 points)
A.
What is the difference between an intermediate host and a definitive host for helminths?
(4)
B.
Describe three ways in which we presently try to limit infectious disease and at least one ongoing
challenge to success in this endeavor.
(7)
C.
What is meant by the term secondary infection? Explain why these may occur.
(6)
D.
In which stage of a disease is the patient most likely to die? Explain why.
(3)
page 6