Frage 1
Frage
The secondary stage of syphilis
Antworten
-
is when the patient is no longer infectious to others.
-
occurs within 10 days of the primary stage.
-
is a time when the pathogen enters and multiplies in the blood.
-
has no symptoms.
-
is when gummas develop in tissues.
Frage 2
Frage
During which stage of syphilis does fever, lymphadenopathy, and a red to brown rash occur?
Frage 3
Frage
Permanent cardiovascular and neurological damage is seen in which stage of syphilis?
Frage 4
Frage
Treponema, Borrelia, and Leptospira are all
Antworten
-
obligate parasites requiring host cells.
-
curved rods.
-
transmitted by arthropod vectors.
-
spirochetes.
-
bacteria without cell walls.
Frage 5
Frage
Yaws, Pinta, and Bejel are all diseases that
Antworten
-
are slow, progressive skin diseases that can spread to deep tissues.
-
are sexually transmitted.
-
are caused by arthropod vectors.
-
are caused by Vibrio species
-
are respiratory tract infections.
Frage 6
Frage
Infected animals shed Leptospira interrogans in their
Antworten
-
feces
-
blood
-
urine
-
respiratory secretions
-
saliva
Frage 7
Frage
Leptospirosis has all the following characteristics except
Antworten
-
most common in cattle, horses, pigs, and dogs
-
pathogen is a spirochete
-
infects kidneys, liver, brain, eyes
-
humans acquire it by contact with abraided skin or mucous membranes
-
can be transmitted by animal bites
Frage 8
Frage
Relapsing fever involves
Antworten
-
soft-bodied ticks transmitting Borrelia hermsii.
-
initial symptoms of fever, headache, fatigue.
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late symptoms of vomiting, muscle aches, damage to liver, spleen, heart and kidneys.
-
human body louse transmitting Borrelia recurrentis.
-
All of the choices are correct.
Frage 9
Frage
The causative agent of Lyme disease is
Antworten
-
Ixodes scapularis
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Borrelia hermsii
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Borrelia burgdorferi
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Ixodes pacificus
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Leptospira interrogans
Frage 10
Frage
Erythema migrans, a bull's-eye rash, at the portal of entry is associated with
Frage 11
Frage
The Argyll Robertson pupil that is fixed and small, and does not react to light but does accommodate for focusing is associated with
Frage 12
Frage
The white-footed mouse, deer, and deer ticks are important to maintaining the enzootic transmission cycle associated with
Frage 13
Frage
Control of rodent populations is important for preventing
Frage 14
Frage
Lyme disease involves
Antworten
-
early symptoms of fever, headache, stiff neck.
-
crippling polyarthritis and cardiovascular and neurological problems.
-
people having contact with wooded or forested areas.
-
treatment with antimicrobics.
-
All of the choices are correct.
Frage 15
Frage
The RPR, VDRL, MHA-TP, FTA-ABS, and TPI tests are used to diagnose
Frage 16
Frage
The virulence of Vibrio cholerae is due to its
Frage 17
Frage
Cholera symptoms are
Antworten
-
copious watery diarrhea
-
loss of blood volume
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acidosis, sunken eyes, thirst
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hypotension, tachycardia, shock
-
All of the choices are correct
Frage 18
Frage
The most immediate and important treatment needed to prevent death in Cholera victims is
Frage 19
Frage
An organism found in coastal waters that causes a food infection and gastroenteritis due to a variety of contaminated raw and undercooked seafood is
Antworten
-
Chlamydia trachomatis
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Vibrio parahaemolyticus
-
Vibrio cholerae
-
Campylobacter jejuni
-
Helicobacter pylori
Frage 20
Frage
In patients with diabetes or liver disease, ingestion of raw oysters contaminated with this organism can lead to death
Antworten
-
Vibrio vulnificus
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Vibrio parahaemolyticus
-
Vibrio cholerae
-
Campylobacter jejuni
-
Helicobacter pylori
Frage 21
Frage
"Rice water stools" are associated with disease caused by this organism:
Antworten
-
Vibrio vulnificus
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Vibrio parahaemolyticus
-
Vibrio cholerae
-
Campylobacter jejuni
-
Helicobacter pylori
Frage 22
Frage
Helicobacter pylori causes
Frage 23
Frage
Which is NOT a characteristic of Helicobacter pylori?
Frage 24
Frage
All of the following are characteristics of Campylobacter jejuni except
Antworten
-
it is transmitted through ingestion of contaminated chicken, meat, milk, and water.
-
it causes fever and a watery to bloody diarrhea.
-
it infects the stomach.
-
it produces an enterotoxin that stimulates diarrhea.
-
it has gram negative curved rods with darting motility.
Frage 25
Frage
Characteristics of rickettsias include
Antworten
-
obligate parasites requiring host cells for growth.
-
arthropods serve as life cycle hosts and vectors.
-
gram negative coccobacilli.
-
host cells are required for ATP metabolism.
-
All of the choices are correct.
Frage 26
Frage
The pathogenesis of rickettsial infections often involves infection of
Frage 27
Frage
Which is mismatched?
Antworten
-
epidemic typhus – body louse feces
-
murine typhus – flea feces
-
rickettsial pox – mite bite
-
Rocky Mountain spotted fever – tick bite
-
human ehrlichiosis – flea bite
Frage 28
Frage
Rocky Mountain spotted fever
Antworten
-
is seen in highest numbers along the west coast.
-
is transmitted by Ixodes ticks
-
has symptoms that include fever, headache and rash.
-
never has severe complications.
-
All of the choices are correct.
Frage 29
Frage
All of the following pertain to erhlichiosis except
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-
it is transmitted by Amblyomma and Ixodes ticks.
-
it causes infection of monocytes.
-
it causes infection of granulocytes.
-
has symptoms that include fever, headache, and muscle pains.
-
the disease is showing a decreased incidence.
Frage 30
Frage
Which is incorrect regarding Q fever?
Antworten
-
transmitted by lice
-
pathogen produces resistant spores
-
humans infected from unpasteurized milk and airborne spread
-
causes fever, muscle aches, rash, and sometimes pneumonia
-
is a zoonosis
Frage 31
Frage
Which is mismatched?
Antworten
-
Rickettsia rickettsii – epidemic typhus
-
Coxiella burnetii – Q fever
-
Bartonella quintana – trench fever
-
Bartonella henselae – cat scratch disease
-
Rickettsia typhi – endemic (murine) typhus
Frage 32
Frage
The following are characteristics of Chlamydias except
Antworten
-
gram negative
-
obligate parasites that need host cells for growth
-
elementary bodies are the infectious form
-
elementary bodies lack enzyme systems for making ATP
-
reticulate bodies differentiate into elementary bodies
Frage 33
Frage
Chlamydia trachomatis causes
Antworten
-
nongonococcal urethritis (NGU) in males.
-
cervicitis in females.
-
congenital and adult inclusion conjunctivitis.
-
ocular trachoma.
-
All of the choices are correct.
Frage 34
Antworten
-
caused by Chlamydia pneumoniae.
-
a zoonosis of certain types of birds
-
a mild, upper respiratory tract illness.
-
has humans as a reservoir for the pathogen.
-
All of the choices are correct.
Frage 35
Frage
Lymphogranuloma venereum is caused by
Frage 36
Frage
Which is incorrect about Mycoplasma pneumoniae?
Antworten
-
has birds as a reservoir
-
common cause of primary atypical pneumonia
-
initially causes fever, malaise, sore throat, headache
-
after 2 to 3 weeks develops into an unproductive cough and earache
-
is a bacterial cell without a cell wall
Frage 37
Frage
Oral flora bacteria on the tooth surface
Antworten
-
develop a biofilm.
-
use fimbriae and slime layers to adhere.
-
include streptococci that metabolize sucrose, produce sticky glucans, and form plaque.
-
lactobacilli and streptococci ferment carbohydrates and produce acids that cause caries.
-
All of the choices are correct.
Frage 38
Antworten
-
primarily caused by anaerobic oral flora.
-
erosion of tooth enamel causing a lesion.
-
caused by Streptococcus mutans
-
also called NUG.
-
None of the choices are correct.
Frage 39
Frage
Ureaplasma urealyticum is implicated in which of the following?
Frage 40
Frage
All of the following can positively influence the structure of tooth enamel except
Antworten
-
fluoride
-
lysozyme in saliva
-
antibodies in saliva
-
refined sugar
-
genetics.
Frage 41
Frage
Treponema vincentii, Bacteroides forsythus, and fusobacteria synergistically are involved in which infection?
Frage 42
Frage
Which of the following distinguishes syphilis from yaws?
Antworten
-
Syphilis is caused by a spirochete
-
Syphilis has a primary, secondary, and tertiary stages.
-
Syphilis is sexually transmitted.
-
Syphilis is treated with antibiotics.
-
Syphilis is a slow and progressive disease.
Frage 43
Frage
Which of the following are other names for yaws?
Frage 44
Frage
Hutchinson's teeth are
Antworten
-
a symptom of untreated Lyme disease.
-
a symptom of untreated periodontal disease.
-
a symptom of ANUG.
-
a symptom of congenital syphilis.
-
a symptom of congenital Chlamydia trachomatis.
Frage 45
Frage
The tertiary stage of syphilis
Antworten
-
is when gummas develop in tissues.
-
is when the patient is highly infectious to others.
-
occurs within 10 days of the primary stage.
-
has no symptoms.
-
is when a chancre develops.
Frage 46
Frage
Which is incorrect about Lyme disease?
Antworten
-
It is a new disease that started in Lyme, Connecticut.
-
Its reservoirs are mice and deer
-
It is transmitted by ticks.
-
It is nonfatal.
-
It can slowly progress and mimic rheumatoid conditions.
Frage 47
Frage
Which of the following diseases could be prevented with proper sewage disposal and water purification?
Frage 48
Frage
Which is incorrect about Leptospirosis?
Antworten
-
It can be avoided by not swimming in livestock watering ponds.
-
A vaccine is not available.
-
Its principle targets are the kidneys, liver, brain, and eyes.
-
It is a zoonosis.
-
Weil's syndrome occurs during the second phase of the disease.
Frage 49
Frage
Which bacteria could be responsible for hemolytic uremic syndrome (HUS)?
Frage 50
Frage
Which of the following is not correct concerning Legionnaires disease?
Antworten
-
L. pneumophila lives in close associations with free-living amebas.
-
The disease is communicable from person to person.
-
Symptoms include cough, diarrhea, and abdominal pain.
-
. It is more common in males over 50 years of age.
-
Cases have been traced to the fallout from the Mount Saint Helen's volcano.
Frage 51
Frage
Which of the following is not correct concerning the plague?
Antworten
-
Mice, voles and other rodents are primary long-term reservoirs.
-
Strains of the plague bacillus are less virulent today as in the Middle Ages
-
It is transmitted by flea vectors.
-
Less than 10 cases per year occur in the US.
-
The etiological agent is Yersinia pestis.
Frage 52
Frage
What is the usual cause of pseudomembranous colitis?
Antworten
-
improperly home-preserved foods containing botulin toxin
-
eating unpasteurized dairy containing Listeria monocytogenes
-
handling infected animals contaminated with E. rhusiopathiae
-
therapy with broad-spectrum antibiotics leading to superinfection by C. difficile
-
living in close contact with someone infected with C. perfringens
Frage 53
Frage
Which of the following may be recommended for treating gangrene?
Antworten
-
debridement of the wound
-
hyperbaric chamber
-
amputation of affected limb
-
rigorous cleansing of deep wounds
-
All of the choices are correct.
Frage 54
Frage
Mild, uncomplicated cases of pseudomembranous colitis may be treated by
Antworten
-
debridement
-
wound cleansing
-
vancomycin for several weeks
-
withdrawal of antibiotics and replacement of lost fluids and electrolytes
-
All of the choices are correct
Frage 55
Frage
Viruses have all the following except
Frage 56
Frage
Host cells of viruses include
Frage 57
Frage
The core of every virus particle always contains
Antworten
-
DNA
-
capsomers
-
enzymes
-
DNA and RNA
-
either DNA or RNA
Frage 58
Frage
Classification of viruses into families involves determining all the following characteristics except
Frage 59
Frage
Which of the following represents a virus family name?
Antworten
-
Herpes simplex virus
-
Herpesviridae
-
Picornavirus
-
Enterovirus
-
Hepatitis B virus
Frage 60
Frage
Virus capsids are made from subunits called
Antworten
-
envelopes
-
spikes
-
capsomeres
-
prophages
-
peplomers
Frage 61
Frage
Helical and icosahedral are terms used to describe the shapes of a virus
Antworten
-
spike
-
capsomere
-
envelope
-
capsid
-
core
Frage 62
Frage
Which of the following is correct about viruses?
Frage 63
Frage
All of the following pertain to virus envelopes except they
Antworten
-
gained as a virus leaves the host cell membrane.
-
gained as a virus leaves the nuclear membrane.
-
contain special virus proteins.
-
help the virus particle attach to host cells.
-
located between the capsid and nucleic acid.
Frage 64
Frage
Which of the following is not associated with every virus?
Antworten
-
envelope
-
capsomers
-
capsid
-
nucleic acid
-
genome
Frage 65
Frage
These structures are used by bacteriophages to attach to host cell receptors
Frage 66
Frage
Which is incorrect about prophages?
Antworten
-
present when the virus is in lysogeny
-
formed when viral DNA enters the bacterial chromosome
-
replicated with host DNA and passed on to progeny
-
cause lysis of host cells
-
occur when temperate phages enter host cells
Frage 67
Antworten
-
include the poxviruses
-
infect Escherichia coli cells
-
enter host cells by engulfment
-
have helical capsids
-
All of the choices are correct.
Frage 68
Frage
The correct sequence of events in viral multiplication is
Antworten
-
penetration, replication, maturation, adsorption, assembly, release.
-
replication, penetration, maturation, assembly, absorption, release.
-
adsorption, penetration, replication, maturation, assembly, release
-
assembly, maturation, replication, release, penetration, adsorption.
-
adsorption, release, maturation, replication, assembly, penetration.
Frage 69
Frage
The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is
Antworten
-
adsorption to the host cells
-
injection of the viral nucleic acid into the host cell
-
host cell synthesis of viral enzymes and capsid proteins
-
assembly of nucleocapsids
-
replication of viral nucleic acid
Frage 70
Frage
Viruses acquire envelopes around their nucleocapsids during
Antworten
-
replication
-
assembly
-
adsorption
-
release
-
penetration
Frage 71
Frage
Which of the following will not support viral cultivation?
Antworten
-
live lab animals
-
embryonated bird eggs
-
primary cell cultures
-
continuous cell cultures
-
blood agar
Frage 72
Frage
In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's _____.
Frage 73
Frage
Host range is limited by
Antworten
-
type of nucleic acid in the virus
-
age of the host cell
-
type of host cell receptors on cell membrane
-
size of the host cell
-
All of the choices are correct.
Frage 74
Frage
The virus-induced, specific damage to the host cell that can be seen in a light microscope is called
Antworten
-
lysogeny
-
budding
-
plaques
-
cytopathic effects
-
pocks
Frage 75
Frage
Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called
Antworten
-
lysogeny
-
budding
-
plaques
-
cytopathic effects
-
pocks
Frage 76
Frage
Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called
Antworten
-
lysogeny
-
budding
-
plaques
-
cytopathic effects
-
pocks
Frage 77
Frage
Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called
Antworten
-
latent
-
oncogenic
-
prions
-
viroids
-
delta agents
Frage 78
Frage
Which of the following is a type of cytopathic effect?
Antworten
-
inclusions in the nucleus
-
multinucleated giant cells.
-
inclusions in the cytoplasm
-
cells round up
-
All of the choices are correct.
Frage 79
Frage
Uncoating of viral nucleic acid
Antworten
-
does not occur in bacteriophage multiplication
-
involves enzymatic destruction of the capsid
-
occurs during penetration in the multiplication cycle
-
occurs before replication
-
All of the choices are correct
Frage 80
Frage
Infectious protein particles are called
Antworten
-
viroids
-
phages
-
prions
-
oncogenic viruses
-
spikes
Frage 81
Frage
Infectious naked strands of RNA are called
Antworten
-
viroids
-
phages
-
prions
-
oncogenic viruses
-
spikes
Frage 82
Frage
Creutzfeld-Jacob disease is
Antworten
-
caused by a chronic latent virus
-
initiated by an oncogenic virus
-
caused by a viroid
-
a spongiform encephalopathy of humans
-
also called "mad cow disease".
Frage 83
Frage
Satellite viruses are
Antworten
-
also called viroids
-
dependent on other viruses for replication
-
the cause of spongiform encephalopathies
-
significant pathogens of plants
-
All of the choices are correct.
Frage 84
Frage
All of the following is correct about treating viral diseases except
Antworten
-
viruses are killed by the same antibiotics that kill bacteria
-
many antiviral drugs block viral replication
-
many antiviral drugs cause severe side effects
-
interferons show potential for treating and preventing viral infections
-
All of the choices are correct.
Frage 85
Frage
The capsomers are made of
Antworten
-
DNA
-
RNA
-
Lipids
-
Protein
-
Carbohydrate
Frage 86
Frage
Viruses that consist of only a nucleocapsid are considered
Antworten
-
simple viruses
-
complex viruses
-
naked viruses
-
viroids
-
incomplete viruses
Frage 87
Frage
The nucleocapsid consists of
Antworten
-
the capsomers assembled into the capsid
-
the nucleic acid of the virus only
-
the nucleic acid along with the capsid
-
the envelope and capsid
-
the envelope, nucleic acid and caspid
Frage 88
Frage
Which of the following parts of a virus is not always present?
Frage 89
Frage
When a virus enters a lysogenic phase, it means
Antworten
-
the virus is integrated into the DNA of the host cell and is latent.
-
the virus is bursting through the host cell membrane.
-
the virus is starting biosynthesis of its nucleic acid.
-
the virus will remain in circulation and not continue infecting its host.
-
the number of viruses in the host is decreasing as the immune system becomes effective.
Frage 90
Frage
All of the following are characteristics of viruses except
Antworten
-
they can be crystallized.
-
they often have a geometric capsid
-
they have a viscous fluid inside their capsids
-
they can cause fatal diseases.
-
they can cause mild diseases.