Download Exam 2 –samples only

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BIOL 2261
Name _______________
Exam 2 –samples only
Choose the Correct answer for each question and place all answers on the scantron sheet.
1.Which of the following indicates a possible case of tuberculosis?
(a)
(b)
(c)
(d)
(e)
The presence of gram-negative cocci in the lung secretions of the patient.
The presence of gram-negative rods with bipolar staining in the lung secretions of the patient.
The presence of acid-fast rods in the lung secretions of the patient.
A positive Weil-Felix test.
A skin rash on the palms of the hands and soles of the feet.
2.
A patient is observed to have a severe upper respiratory tract with a loose, membranous tissue
covering the back of the throat. Which of the following tests is indicated?
(a)
(b)
(c)
a Weil-Felix test
acid-fast stain of the material from a throat swab
a methylene blue simple stain to test for bacteria having metachromatic granules and coryneform
arrangement
a biochemical test to distinguish Salmonella from other Enterobacteriaceae
staining the material from a throat swab with fluorescent antisera to detect a spirochete
(d)
(e)
3. Hemophilus influenzae is recognized as an important cause of
(a)
(b)
(c)
(d)
(e)
meningitis in young children.
cervical tumors.
renal failure in patients with suppressed immune systems.
skin ulcers in patients from tropical regions.
chancroid
4. Both staphylococcal food poisoning and salmonellosis can be acquired by eating contaminated food.
After eating contaminated food, the time required for the onset of staphylococcal food poisoning
is shorter than that for salmonellosis because
(a)
(b)
Staphylococcus aureus grows more rapidly than Salmonella enteritidis serotypes.
cells of Salmonella must reach the bloodstream before symptoms of gastrointestinal irritation are
experienced.
(c)
foods that contain Salmonella are usually eaten raw.
(d)
Staphylococcus aureus grows only under conditions of high salt concentration.
(e)
staphylococcal food poisoning is due to the presence of an exotoxin that forms in the food before
it is eaten, but salmonellosis requires the colonization and growth of the bacteria in the intestine.
5. Which of the following describes the organism responsible for bubonic plague?
(a)
(b)
(c)
(d)
(e)
a strictly aerobic, spore-forming rod
a spirochete
a gram-negative rod with bipolar staining
a gram-positive rod with metachromatic granules
a strictly anaerobic, spore-forming rod
6. Wound infections of Clostridium perfringens are often accompanied by
(a)
large, open sores on the body.
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(b)
(c)
(d)
(e)
intestinal ulceration.
a red-colored skin rash.
gas gangrene.
fluid buildup in the lung tissue.
7. Staphylococcus aureus has been linked to all of the following conditions EXCEPT
(a)
(b)
impetigo.
toxic shock syndrome.
(c)
Rocky Mountain Spotted Fever
(d)
the scalded skin syndrome.
(e) boils and pimples.
8. Which of the following organisms is responsible for epidemic typhus?
(a)
(b)
(c)
Salmonella typhi
Rickettsia typhi
Rickettsia prowazekii
(d)
(e)
Rickettsia rickettsii
Clostridium tetani
9. The principal mode of transmission for Rocky Mountain Spotted Fever is
(a)
(b)
(c)
(d)
(e)
blood transfusion
sexual contact
bite of an infected tick
inhalation of bacteria that cause the disease
ingestion of food contaminated with bacterial spores
10.
Epidemic typhus is likely to occur where sanitation is lacking and where hygiene is poor because
(a)
(b)
(c)
(d)
(e)
human lice flourish under these conditions.
the typhus bacteria are usually transmitted by drinking contaminated water.
unsanitary living conditions attract the ticks that transmit the disease.
large numbers of live typhus bacteria are shed in the feces of infected persons.
the typhus bacteria grow in urine-contaminated soil.
11. Middle ear infections are common in children because
A) they do not secrete cerumen
B) their tympanic membranes are thinner than in adults
C) their Eustachian tubes are shorter and wider
D) two of the above
12. Which of the following statements about normal microflora of the respiratory system is incorrect?
A) The presence of Haemophilus in the pharynx does not indicate disease.
B) About 1/3 of the population carries Staphylococcus aureus in their nasal cavity.
C) Coccidioides immitis is a harmless part of the microflora.
D) Nasal carriers of Staphylococcus aureus can easily spread it to other individuals.
13.Infection due to Hemophilus ducreyi may be identified by the isolation of
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(a)
(b)
(c)
(d)
(e)
gram-positive cocci from skin lesions.
gram-negative cocci from the spinal fluid.
gram-negative rods from the soft chancres.
gram-positive rods from the feces.
spirochetes from the vaginal secretions.
14. Infantile diarrhea and traveller’s diarrhea are commonly caused by
(a)
(b)
(c)
Escherichia coli
Clostridium botulinum
Bacillus anthracis
(d)
(e)
Treponema pallidum
Listeria monocytogenes
15. Soil contains human pathogens, for instance
A) Clostridium tetani
B) Bacillus anthracis
C) Clostridium perfringens
D) all of the above
16. The indicator organism for human pathogens in a water supply is
A) Escherichia coli
B) Salmonella typhi
C) Poliovirus
D) Staphylococcus aureus
17. The most problematic yet common form of tertiary treatment of water is
A) chlorine
B) UV light
C) ozone
D) X-rays
18. 1. Food contamination is due to
A) unsanitary practices by food handlers
B) improper storage
C) importation
D) all of the above
19. Some strains of _______ can inhibit the growth of other organisms by decreasing the pH and making
hydrogen peroxide.
A) Lactobacillus
B) Staphylococcus
C) Vibrio
D) Clostridium
20. Which bacteria are responsible for nearly half the infections associated with mishandling of poultry
in restaurants?
A) Salmonella
B) Pseudomonas
C) Trichinella spiralis
D) Lactobacilli
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