Parasitology Exam 3 and answers
unicellularProtozoan parasites are _________
(unicellular/multicellular)
eukaryotesProtozoans are ______________
(eukaryotes/prokaryotes)
false; they lack thistrue or false
protists have a cell wall
false; they require moisture and this isn't ...
Parasitology Exam 3 and answers
unicellular✔✔Protozoan parasites are _________
(unicellular/multicellular)
eukaryotes✔✔Protozoans are ______________
(eukaryotes/prokaryotes)
false; they lack this✔✔true or false
protists have a cell wall
false; they require moisture and this isn't really a problem for most parasitic
protozoa✔✔true or false
protists do not require a lot of moisture
encyst✔✔Should drying occur, many parasites have the ability to
_______________-secrete a resistant cyst wall around themselves to survive harsh
conditions away from a host.
-flagella
-cillia
-pseudopodia✔✔What do protists use for motility (3 answers)
true✔✔true or false
protists can utilize sexual and asexual reproduction
binary fission✔✔asexual reproduction in protists is known by ____________
true✔✔true or false
the protists are divided into groups based on locomotion, location, and reproduction
soil and water✔✔Most amoebae are free-living organisms in ______________
troph and cyst✔✔Amoebae have 2 life stages. What are they?
asexual reproduction✔✔Amoebae reproduce via
human to human✔✔How are amoebae transmitted
obligate and facultative✔✔there are 2 groups of parasitic amoebae what are they
digestive tract✔✔obligate parasitic amoebae occur in the _________ in the human
host
soil and water✔✔facultative parasitic amoebae are free living in _______________
and can become parasitic if they enter vertebrate tissues
,obligate✔✔Entamoeba histolytica is (obligate/facultative)
Entamoeba histolytica✔✔_____________ is the most common pathogenic amoeba
to parasitize humans
Entamoeba histolytica✔✔_____________ is the causitive agent of Amoebiasis /
Amoebic Dysentery
Entamoeba histolytica✔✔an outbreak of ____________ at the wold fair in chicago in
1933 caused an outbreak due to defective plumbing. This led to 1000 cases.
red blood cells✔✔the trophozoite of Entamoeba histolytica often contains
___________ in their food vacuoles and its a diagnostic characteristic
centrally✔✔the tophozoite of Entamoeba histolytica has a characteristic structure is
the single nucleus with one endosome that is _______________ located
true✔✔true or false
the trophozoite of Entamoeba histolytica living specimens show active, rapid
movement
large intestine✔✔what is the primary habitat of the trophozoites of Entamoeba
histolytica in their human hosts
- rapid movement
- directional movement
- finger like / explosive pseudopods
- large central endosome with ring of chromatin and delicate envelope✔✔Entamoeba
histolytica trophozoite
unfavorable conditions✔✔encystment is stimulated by ___________________
precyst✔✔the _________ of Entamoeba histolytica secretes cyst wall to form the
round cyst
uninucleate
binucleate
quadrinucleate✔✔fill in the blanks
nuclear division begins after encystment
__________ cyst -> ________ cyst -> _________ or mature cyst
chromatoidal bars✔✔Entamoeba histolytica cysts have rod-shaped
______________
young cysts✔✔chromatoidal bars and vacuoles are most common in
______________ for Entamoeba histolytica
packaged RNA✔✔Entamoeba histolytica cyst has cigar shaped areas of _______
, night-soil (human waste)✔✔a common source of infection of Entamoeba histolytica
is the use of ____________ as fertilizer
troph or cyst in stool✔✔the diagnostic stage of Entamoeba histolytica is
_____________
cyst ingestion✔✔The infective stage of Entamoeba histolytica is
1 month✔✔cysts of Entamoeba histolytica can remain viable in a moist environment
for _________
food/water✔✔Infection of Entamoeba histolytica occurs when infective cysts are
ingested in _____________that has been contaminated with human feces.
fecal-oral✔✔Entamoeba histolytica is transmitted through __________ route
alkaline pH✔✔encystment of Entamoeba histolytica happens in the small intestine
due to ____________
8✔✔Metacystic amoeba (Entamoeba histolytica ) undergoes multiple fission to form
____ trophozoites.
proteolytic enzymes cause necrosis ; mucus and trophs pass✔✔how does
Entamoeba histolytica affect the body by colonization of the large intestine
Entamoeba histolytica✔✔"flask" ulcers in the large intestine are a symptom of
blood and pus in stool✔✔what are the symptoms of Entamoeba histolytica
submucosa✔✔Ulcers of Entamoeba histolytica extend deep into the
_________________and may extend completely through the large intestine
metastasize to ectopic sites✔✔Trophozoites of Entamoeba histolytica invade the
blood vessels of the submucosa and ___________________
1. hapatic amebiasis
2. pulmonary amebiasis
3. cerebral amebiasis✔✔extra-intestinal lesions caused from Entamoeba histolytica
occur in 3 ectopic sites
~Trophozoites in submucosa are carried by hepatic portal vein to the liver.
~Trophozoites digest away liver tissue forming absesses
- some to size of grapefruit✔✔describe hepatic amebiasis
Liver abscess ruptures
Trophozoites digest through the diaphragm into the lungs to form a pulmonary
absess✔✔describe pulmonary amebiasis
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