Parasitology Exam 1- Lecture Quizes
and answers
d. stool✔✔The most common specimen submitted to the laboratory for detection of
parasites is:
a. blood
b. sputum
c. urine
d. stool
b. definitive host.✔✔The parasite host in which the reproductive phase of parasite
development occurs is called the:
a. obligatory host.
b. definitive host.
c. intermediate host.
d. reservoir host.
c. continue the parasite's life cycle.✔✔The purpose of a parasite infection of a host is
to:
a. cause disease in or kill the host.
b. use the host as a food source.
c. continue the parasite's life cycle.
d. damage the host's immune system.
b. Altering their antigenic makeup✔✔Which of the following is an example of a
parasite defense mechanism against the host's immune system?
a. Releasing invasive enzymes
b. Altering their antigenic makeup
c. Hiding inside cells or tissues
d. Releasing toxic factors
b. PCR.✔✔Recent developments in testing methods for detection and identification
of parasites include:
a. formalin-ethyl acetate concentrations.
b. PCR.
c. zinc sulfate flotation.
d. thick blood smears.
...✔✔A physician suspects that a patient has a tapeworm and orders a rapid stool
screen or direct antigen test. What action should the laboratory take?
a. Reject the order and discard the specimen
b. Reject the order and discard the specimen
, c. Perform the test as requested
d. Change the order to a formalin-ethyl acetate concentration
a. Giardia lamblia✔✔A young couple has spent the last week backpack camping in
Colorado. The day they returned from vacation, both individuals have symptoms of
diarrhea and general gastrointestinal distress. Which of the following parasites may
be involved?
a. Giardia lamblia
b. Entamoeba histolytica
c. Dientamoeba fragilis
d. Ascaris lumbricoides
a. Thick blood smear✔✔The cellophane tape prep is the specimen of choice for the
detection of Enterobius vermicularis (pinworm) eggs (Chapter 8). Adult female
pinworms may also be seen. At night, when the body is at rest, pregnant adult
female worms exit the host, typically a child, through the rectum and lay numerous
eggs in the perianal region. Therefore, it is important that the specimen be collected
in the morning before the patient washes or defecates.
a. Thick blood smear
b. Duodenal aspirate
c. Thin blood smear
d. Tissue biopsy
b. pathogenic✔✔A liquid stool sample is submitted to the laboratory within 30
minutes of collection. A wet prep reveals a trophozoite with rapid, unidirectional
movement. The permanent smear demonstrates a trophozoite approximately 20 μm
in size with only one nucleus, a centrally located karysome, a finely granulated
cytoplasm, uneven peripheral chromatin, and RBC inclusions. The structure
observed is considered:
a. nonpathogenic
b. pathogenic
c. an artifact
d. none of these
c. type of motility.✔✔The following key characteristics are useful in the differentiation
of the various ameba EXCEPT:
a. size.
b. cytoplasmic inclusion.
c. type of motility.
d. number of nuclei.
b. Continue to examine sample for other possible parasites✔✔A parasitic
examination is requested on a fecal sample collected from a patient who recently
traveled to Thailand. Upon examination, cysts approximately 22 μm were found with
and answers
d. stool✔✔The most common specimen submitted to the laboratory for detection of
parasites is:
a. blood
b. sputum
c. urine
d. stool
b. definitive host.✔✔The parasite host in which the reproductive phase of parasite
development occurs is called the:
a. obligatory host.
b. definitive host.
c. intermediate host.
d. reservoir host.
c. continue the parasite's life cycle.✔✔The purpose of a parasite infection of a host is
to:
a. cause disease in or kill the host.
b. use the host as a food source.
c. continue the parasite's life cycle.
d. damage the host's immune system.
b. Altering their antigenic makeup✔✔Which of the following is an example of a
parasite defense mechanism against the host's immune system?
a. Releasing invasive enzymes
b. Altering their antigenic makeup
c. Hiding inside cells or tissues
d. Releasing toxic factors
b. PCR.✔✔Recent developments in testing methods for detection and identification
of parasites include:
a. formalin-ethyl acetate concentrations.
b. PCR.
c. zinc sulfate flotation.
d. thick blood smears.
...✔✔A physician suspects that a patient has a tapeworm and orders a rapid stool
screen or direct antigen test. What action should the laboratory take?
a. Reject the order and discard the specimen
b. Reject the order and discard the specimen
, c. Perform the test as requested
d. Change the order to a formalin-ethyl acetate concentration
a. Giardia lamblia✔✔A young couple has spent the last week backpack camping in
Colorado. The day they returned from vacation, both individuals have symptoms of
diarrhea and general gastrointestinal distress. Which of the following parasites may
be involved?
a. Giardia lamblia
b. Entamoeba histolytica
c. Dientamoeba fragilis
d. Ascaris lumbricoides
a. Thick blood smear✔✔The cellophane tape prep is the specimen of choice for the
detection of Enterobius vermicularis (pinworm) eggs (Chapter 8). Adult female
pinworms may also be seen. At night, when the body is at rest, pregnant adult
female worms exit the host, typically a child, through the rectum and lay numerous
eggs in the perianal region. Therefore, it is important that the specimen be collected
in the morning before the patient washes or defecates.
a. Thick blood smear
b. Duodenal aspirate
c. Thin blood smear
d. Tissue biopsy
b. pathogenic✔✔A liquid stool sample is submitted to the laboratory within 30
minutes of collection. A wet prep reveals a trophozoite with rapid, unidirectional
movement. The permanent smear demonstrates a trophozoite approximately 20 μm
in size with only one nucleus, a centrally located karysome, a finely granulated
cytoplasm, uneven peripheral chromatin, and RBC inclusions. The structure
observed is considered:
a. nonpathogenic
b. pathogenic
c. an artifact
d. none of these
c. type of motility.✔✔The following key characteristics are useful in the differentiation
of the various ameba EXCEPT:
a. size.
b. cytoplasmic inclusion.
c. type of motility.
d. number of nuclei.
b. Continue to examine sample for other possible parasites✔✔A parasitic
examination is requested on a fecal sample collected from a patient who recently
traveled to Thailand. Upon examination, cysts approximately 22 μm were found with
