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37 Cards in this Set
- Front
- Back
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Ancient members of the group _________ were the first living organisms on earth.
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Archaea
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Because protists groups cannot be drawn back to a single common ancestor the group is considered to be....
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Polyphyletic
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Protists are believed to have arisen about ___________ years ago.
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1.5 billion
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The most recent classification scheme put forth by the International Society of Protistologists places protists into six...
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Super groups
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In a protist, the portion of the cytoplasm that lies just beneath the plasma membrane (pellicle) is called the...
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Ectoplasm
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Contractile vacuoles in freshwater protozoans function to...
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Remove excess water.
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In some protists, food may be ingested in a special region, the....
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Cytopharynx
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In heterotrophic protists, digestion and transport of food occurs in...
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Food Vacuoles.
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Egestion vacuoles release their contents by...
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Exocytosis
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Egestion vacuoles release their contents through the...
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Cytopyge
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The principal nitrogenous waste of protozoans is...
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Ammonia
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In protists, both gas exchange and excretion occur by _________ across the plasma membrane.
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Diffusion
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The common means of sexual reproduction among ciliated protists is...
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Conjugation
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___________ occurs in protists when a large number of daughter cells are formed from a single parent cell.
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Schizogeny
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Protists in this super group are amoeboid in morphology and have very fine pseudopodia called filopodia.
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Rhizaria
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"Red-tides" are caused by...
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Radiolarians.
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The protozoan Trypanosoma brucei is the causal organism of the disease...
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African sleeping sickness.
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The vectors of Trypanosoma are...
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Tsetse flies.
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___________ is one of the opportunistic diseases affecting AIDS patients in the US.
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Toxoplasma
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Toxoplasmosis is primarily carried to humans by...
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Cats
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Pseudopodia that are broad and are used for locomotion and engulfing food are called...
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Lobopodia
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Members of the genus Amoeba ingest food by...
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Phagocytosis
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A(n) __________ protozoan would possess a lobopodium.
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Amoeba
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The pathogenic amoeba that causes dysentery in humans is....
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Entamoeba histolytica
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The white cliffs of Dover are an example of a/an __________ chalk deposit.
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Foraminiferan
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Some of the oldest eukaryotic fossils are...
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Radiolarians
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A process known as __________ begins the sexual phase of the coccidean life cycle.
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Gametogeny
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Ancient Egyptian records indicate humans were infected with which parasite?
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Plasmodium
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All ciliates have a large ___________ nucleus that controls normal functions.
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Polyploid
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Of the protozoans listed below, which one is capable of photosynthesis?
Giardia, Toxoplasms, Euglena, Trypansoma, Plasmodium |
Euglena
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Many __________ are symbiotic in the digestive tracts of ruminate ungulates (hoofed mammals), and aid in digestion for their hosts.
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Ciliates
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In the ciliates, one of more __________ serve as the genetic reserve of the cell
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Micronuclei
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Protozoans in this group are nearly all parasites of humans.
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Apicomplexans
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Ciliates have a distinct "cell mouth" called a...
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Cytostome
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An economically important disease of poultry is...
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Coccidiosis
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Sexual reproduction of ciliates involves a process called...
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Conjugation
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An important parasitic ciliate that lives in the large intestines of humans, pigs, and other mammals is...
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Balantidium coli
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