A 38-year-old intravenous drug user presented at a clinic with a swollen, tender
abdomen. The sclera of his eyes were yellow (icteric), and his skin had a faint yellow
coloration. A direct fluorescent antibody test was positive for a particular infectious
agent. What is unusual about this agent?...
BIOL 221 Exam 4 MCQs
A 38-year-old intravenous drug user presented at a clinic with a swollen, tender
abdomen. The sclera of his eyes were yellow (icteric), and his skin had a faint yellow
coloration. A direct fluorescent antibody test was positive for a particular infectious
agent. What is unusual about this agent? - ✔️✔️it is a DNA virus that needs reverse
transcriptase to replicate
Which of the following is a major virulence factor in Helicobacter pylori? - ✔️✔️the
enzyme urease
What is the most effective treatment for cholera? - ✔️✔️oral rehydration with isotonic
electrolyte
Which of the following is NOT a part of the Shigella disease cycle? - ✔️✔️eventually
colonizes the gallbladder, where it can persist for years
The usual location of a mumps infection is... - ✔️✔️glandular epithelial cells
In an experiment, test subjects are given a diet without sucrose, while control subjects
are given a diet with sucrose. Which of the following results would NOT be expected? -
✔️✔️test subjects would have a more acidic oral pH
Which of the following do the Hepatitis A and B viruses have in common? - ✔️✔️the
location of the infection in the host's body
The object at the right was isolated from a patient with diarrhea. What is it? - ✔️✔️a
giardia trophozoite
A patient presents at a clinic in Mumbai with voluminous "ricewater stool" diarrhea. The
best treatment would consist of what? - ✔️✔️slowly sipping a solution of glucose and
salts
Chronic diarrhea can be caused by a trophozoite that burrows into and sometimes
through the intestinal lining, causing irritation and abscesses. Which of the following
public health steps would reduce the spread of this disease in a community? -
✔️✔️avoiding the use of human feces from septic tanks as a fertilizer
Please use the choices below for questions 11 and 12:
a. helicobacter
b. cholera
,c. hepatitis a
d. hepatitis b
e. e. coli
11. Produces the CagA and VacA exotoxins, causing inflammation and enabling it to
survive at low pH.
12. A 48-year-old male patient presents at a clinic with a fever of 39 degrees C,
jaundice, and dark orange urine. His arms show needle tracks from i.v. drug abuse, and
his abdomen is tender on palpation. He would probably have a high antibody titer for... -
✔️✔️11. a. helicobacter
12. d. hepatitis b
Which of the following is NOT a virulence factor associated with Helicobacter pylori? -
✔️✔️an IgG Fc binding protein
This could be considered the most serious hepatitis infection, since it is chronic, causes
liver cancer and organ failure, and there is no vaccine for it. - ✔️✔️hepatitis C
Rita Colwell won the Nobel Prize for figuring out that you can stop a Cholera epidemic
by filtering water through ordinary cloth. How does this work? - ✔️✔️you're filtering out
a mechanical vector of Vibrio cholerae
This vaccine-preventable virus is worse in adults than it is in children because it can
cause inflammation of the testes and ovaries. - ✔️✔️mumps
The organism shown below were isolated from frothy, foul smelling diarrhea from a
hiker on the Appalachian Trail, who was successfully treated with metronidazole. They
are... - ✔️✔️giardia trophozoites
All of the following are virulence factors of Helicobacter pylori EXCEPT... -
✔️✔️survival in phagocytes
This week there was a multi-state recall of sushi from yellow fin tuna that is
contaminated with Salmonella. You didn't hear about that? You like sushi? Damn! What
symptoms can you expect to experience if you got infected? - ✔️✔️intestinal cramps
and diarrhea with some blood in the stool
Jordyn is into the party scene at her college. She drinks a lot, occasionally injects drugs
at parties and has sex with three boyfriends (Jordyn's situation is not all that uncommon,
by the way). She is putting herself at increased risk for all of the following EXCEPT... -
✔️✔️mumps
Infection with which of the following is more common in the US than in developing
countries? - ✔️✔️streptococcus mutans
, Helicobacter pylori has all off the following virulence factors EXCEPT... - ✔️✔️a
secretion of an A-B toxin that increases cAMP production
A particular variety of _____ is engulfed by GALT macrophages but not killed. Instead it
travels within the macrophages throughout the body, causing high fever and organ
failure, eventually becoming established in the gall bladder. - ✔️✔️salmonella
A cause of jaundice and liver inflammation, this infection normally lasts a few weeks,
and then goes away on its own. It can be prevented with a vaccine, or by avoiding food
prepared under unhygienic conditions. - ✔️✔️hepatitis A
The cyst of the organism seen below is found in feces. Where would it normally release
trophozoites? - ✔️✔️in the colon
A 20-year-old female was seen at a local university clinic for fever, malaise, and a
maculopapular rash on the palms of her hands. Upon further questioning, she revealed
that she had noticed a painless genital ulcer about a month ago, but it disappeared and
she had not worried about it. What is her illness? - ✔️✔️syphilis
Why are gonorrhea and chlamydia much more serious in women than in men? -
✔️✔️the organisms can ascend the Fallopian tubes and cause pelvic inflammatory
disease
Other than signs of meningitis, which of the following is indicative of infection with
Neisseria meningitidis? - ✔️✔️a purpuric skin rash and petechial hemorrhages
Several campers at a summer camp in the Ozarks developed fever and jaundice, and
one experienced kidney failure. Upon investigation, it was found that the camp had
been in the habit of relaxing the "no dogs on the beach" rule. A likely diagnosis is: -
✔️✔️leptospirosis
A young woman who has recently become sexually active comes to a clinic with a
burning sensation when she urinates. The urine is cloudy. There are no other
symptoms. With what is she probably infected? - ✔️✔️Escherichia coli
This from a newspaper: "High School senior M***** G****, 17, took a state Regents
exam Wednesday and went to bed with flu-like symptoms that night. By Thursday
morning, he couldn't move his neck, and he had broken out in a rash. He was so ill he
was taken to a local hospital. By Thursday afternoon, he was dead." From what did this
student most likely die? - ✔️✔️bacterial meningitis
What is the best way to diagnosis syphilis in its primary stage? - ✔️✔️perform a direct
fluorescent antibody test
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