Quiz 25: Protists

The simultaneous use of both organic and inorganic forms of carbon is called ________________. A)osmotrophy B)omnitrophy C)mixotrophy D)metatrophy

When protists feed on solid nutrients such as bacteria by phagocytosis,they are said to be using ____________ nutrition. A)saprozoic B)holozoic C)endozoic D)parasitic

All photosynthetic protists A)carry out oxygenic photosynthesis using two photosystems. B)carry out oxygenic photosynthesis using one photosystem. C)carry out anoxygenic photosynthesis using two photosystems. D)carry out anoxygenic photosynthesis using one photosystem.

The study of algae is referred to as A)phycology. B)phytology. C)mycology. D)None of the choices are correct.

Which of the following statements is not true of protists? A)Moisture is absolutely essential to their existence. B)Most are free living. C)They make up a substantial fraction of the marine plankton. D)They are not known to cause diseases of humans.

Which of the following is rare among protists? A)Motility B)Multicellular C)Eukaryotic D)None of these characteristics are rare among protists.

Trypanosomes that cause disease in humans escape destruction by the human immune system because they are resistant to phagocytosis.

Unlike Giardia,most members of the Fornicata are harmless symbionts.

Recent evidence suggests that hydrogenosomes and mitochondria evolved from different endosymbiotically derived organelles.

Euglena use a contractile vacuole for osmotic regulation.

The pellicle of a Euglena cell consists of A)glycoprotein. B)polysaccharide. C)peptidoglycan. D)protein strips and microtubules.

The cellulase-excreting protist that can account for up to one-third of the biomass of a termite is a member of the genus A)Hexamida. B)Trichomonas. C)Trichonympha. D)Euglena.

A typical Euglena cell is elongated and bounded by a _________________ A)protuberance. B)pellicle. C)cytoproct. D)plasmalemma.

Which of the following is found in the intestine of termites and produces enzymes needed to digest wood particles? A)Giardia B)Trichomonas C)Trichonymphida D)Nyctotherus

Which of the following is a unique organelle found within some protists but not in higher animal cells? A)Mitochondrion B)Contractile vacuole C)Golgi apparatus D)Endoplasmic reticulum

The most common method of asexual reproduction in protists is A)budding. B)cytokinesis. C)fission. D)fragmentation.

Some anaerobic protists obtain energy using A)mitochondria. B)cytochromes. C)hydrogenosomes. D)All of the choices are correct.

Pigment is contained in an eyespot or __________ that helps certain organisms orient to light.

Acellular slime molds form a large multinucleate mass called a(n)______________ .

Sexual reproduction in the cellular slime mold Dictyostelium discoideum involves the production of special spores called A)amoeba flagellates. B)macrocysts. C)sporozoites. D)discoidia.

Which of the following is not true regarding Entamoeba histolytica? A)Entamoeba histolytica always remains in the intestinal tract during an infection. B)Entamoeba histolytica cysts pass through the stomach unharmed. C)Entamoeba histolytica grazes on bacteria in the intestines. D)Entamoeba histolytica produces enzymes that degrade epithelial tissue.

Which of the following is not a type of pseudopod found in protozoa? A)Lobopodia B)Peripodia C)Reticulopodia D)Filopodia

A cyst formed by a protist functions A)as a protective mechanism against adverse changes in the environment. B)in repair of damage to the cell envelope. C)in transfer from one host to the next. D)as a protective mechanism against adverse changes in the environment and in transfer from one host to the next.

Foraminifera are a type of protist that A)help in estimating the age of ocean deposits. B)move by means of flagella. C)cause malaria. D)are associated with human disease.

Filopodia supported by microtubules that are used primarily in feeding are called __________________. A)lobopodia B)reticulopodia C)axopodia D)micropodia

Most radiolaria have an internal skeleton made of A)microtubules. B)glycoproteins. C)cellulose. D)siliceous material.

Protist cells that produce gametes for sexual reproduction are most specifically called ___________.

__________ from foraminifera make up the White Cliffs of Dover and the stones used to build the great pyramids.

_____________ produce 40 to 50 percent of the organic carbon in the ocean.

Diatoms have a distinctive two-piece wall of silica called a frustule.

Species of dinoflagellates are responsible for much of the phosphorescence seen in ocean waters at night.

The Stramenopila are a very large and diverse group that all possess __________ at some point in their life cycle. A)a macronucleus B)chloroplasts C)an exoskeleton D)heterokont flagella

Some ciliophora can discharge toxic threadlike darts called ___________,which are used in capturing prey. A)spikes B)spicules C)toxicysts D)toxipodia

A protist with two flagella where one is wrapped around a transverse groove and the other is draped in a longitudinal groove would be a member of which group? A)Ciliophora B)Dinoflagellate C)Trypanosome D)Oomycetes

Apicomplexan organisms such as Plasmodium possess a motile,infective stage called the _____________. A)sporozoite B)trophozoite C)apizoite D)None of the choices are correct.

Which of the following groups is responsible for toxic red tides? A)Dinoflagellates B)Diatoms C)Trypanosomes D)Foraminifera

Diatoms A)are photosynthetic with frustules composed of two halves. B)can reproduce asexually. C)are motile by virtue of having flagella. D)are photosynthetic with frustules composed of two halves and can reproduce asexually.

Those dinoflagellates that live in an intimate association with corals are called A)zooxanthellae. B)parasites. C)lichens. D)phytoplankton.

In labyrinthulids,the nonflagellated stage of the life cycle features spindle-shaped cells that form complex colonies that glide rapidly along an ______________ net made by the organism. A)ectoplasmic B)endoplasmic C)protoplasmic D)pellicular

Ciliate sexual reproduction by conjugation differs from sexual reproduction in most animals in that A)both parents are converted into zygotes. B)meiosis occurs in both partners. C)cell fusion occurs during fertilization. D)the zygotic nucleus is diploid.

Which of the following ciliates produces the disease ick in fish? A)Entodinium B)Nyctotherus C)Ichthyophthirius D)Balantidium

Which of the following apicomplexan genera cause coccidiosis in chickens? A)Pneumocystis B)Eimeria C)Plasmodium D)Toxoplasma

The apical complex in the apicomplexans A)is located at one end of the cell. B)aids in penetration of host cells. C)contains mitochondria. D)is located at one end of the cell and aids in penetration of host cells.

Protothecosis is an infection of humans or animals that is caused by a chlorophyte (green algae).

The Chloroplastida (green algae)include a wide diversity of forms ranging from unicellular to colonial individuals.

If plants originated from an organism like Chlamydomonas,then the origin of plants involved the loss of A)chloroplasts. B)microtubules. C)cell walls. D)flagella.

Which of the following is not true of the Chloroplastida (green algae)? A)Their cell walls contain chitin. B)They are found in fresh and salt water. C)They have chlorophylls a and b. D)They store carbohydrates as starch.

Upon ingestion of a food particle by a protozoan,the food particle is in a/an A)lysosome. B)mitochondrion. C)phagocytic vacuole. D)endoplasmic reticulum.

After ingestion of a food particle,pH changes and enzymes contributed by the ________________ will digest and hydrolyze the ingested particle in the phagocytic vacuole. A)mitochondria B)lysosome C)plasma membrane D)endoplasmic reticulum

Which of the following would inhibit binary fission in protists,but not in bacteria? A)Blocking DNA replication B)Blocking RNA synthesis C)Blocking spindle function D)Blocking ribosome function

Sexual reproduction in protists involves diverse strategies.Which of the following is common to all types of sexual reproduction in protists? A)Syngamy B)Isogamy C)Heterogamy D)Anisogamy E)Conjugation

Which of the following statements best describes the difference between mitosomes and mitochondria? A)Mitosomes have one membrane whereas mitochondria have a double membrane. B)Mitosomes are not involved in ATP production. C)Mitosomes are much larger than mitochondria. D)Mitosomes contain hydrolytic enzymes that help the protozoan digest food particles.

In which of the following locations would you be most likely to find a species of Euglena? A)Rumen of a dairy cow B)Intestine of humans C)Pond D)Garden soil

If a population of termites were treated with a chemical that destroyed all of the trichonymphids living in their gut,what would be the most likely consequence? A)The individual termites would grow to be much larger. B)The termites would die because they would not be able to digest cellulose in wood. C)The termites would be able reproduce more rapidly and their population would expand. D)The termites would turn to alternative sources of nutrients.

Trichomoniasis in humans is caused by a member of the _____________ group of protists. A)Fornicata B)Parabasalia C)Euglenozoa D)Amoebozoa

Both Chagas' disease and African Sleeping Sickness are __________-borne diseases. or

You're describing a newly discovered protozoa that has long filamentous pseudopods.Which term best fits these pseudopods? A)Lobopods B)Hyphopods C)Reticulopods D)Filopods

What is the most likely role of the tests in a testate amoeba? A)Provide motility B)Concentrate nutrients C)Provide protection D)Enable adherence to surfaces

Some amoebae have a covering over their plasma membrane.These amoebae are referred to as ____________ amoebae.

What conditions result in the release of cAMP from Dictyostelium discoideum? A)Abundance of nutrients B)Adequate moisture C)Shortage of nutrients D)Presence of predator bacteria

What are the results of the release of cAMP from Dictyostelium discoideum? A)The cells develop flagella. B)The cells form cysts until the growing conditions improve. C)The larger cells cannibalize the smaller,less developed cells. D)Cells aggregate,forming a large motile multicellular slug,precursor to the development of a fruiting body.

Which would be the??? most likely location to find a slime mold? A)Swiftly running stream B)Animal gastrointestinal tract C)Pond D)Rotting log

Axopodia of Rhizaria are used for feeding rather than for motility.

Filopodia that are supported by microtubules are known as A)axopodia. B)lophopodia. C)micropodia. D)reticulopodia. E)tubulopodia.

Which statement about the macronucleus and the micronucleus of ciliates is correct? A)The micronucleus transmits genetic information through mitosis and meiosis,while the macronucleus maintains routine cellular functions. B)The macronucleus is diploid and the micronucleus is haploid. C)The micronucleus is formed by fission of the macronucleus. D)The macronucleus forms by the fusion of micronuclei from two different mating types.

What is the role of the apical complex in apicomplexans? A)The apical complex is a motility structure that enables cell movement. B)The apical complex enables the apicomplexan to penetrate and bore into a host cell. C)The apical complex is a feeding structure through which small food particles are taken in. D)The apical complex is a defensive structure that is used to destroy bacteria.

All of the following are true statements about events that occur in the apicomplexan life cycle EXCEPT A)The life cycles include both sexual and asexual stages. B)The sporozoite is the motile infective stage. C)Often two completely different organisms host different stages of the life cycle. D)The haploid and diploid generations alternate. E)There is no exception here.All of these statements are true.

The stramenopiles are an extremely diverse group of organisms which would appear to have very little in common with one another.The one unifying feature in this group is the presence of _________________ ________________ at some point in the life cycle.

What is the most likely reason the peronsporomycetes were originally thought to be fungi? A)Macroscopic appearance of fuzzy growth B)Cell wall composition C)Yeast like cellular morphology D)Life cycle similar to that of many fungi

Which of the following morphologies are seen among the Chloroplastida? A)Filamentous B)Unicellular C)Colonial D)Sheet-like E)All of the choices are correct.

All of these statements about Chlamydomonas are true,EXCEPT A)chlamydomonas only reproduces asexually. B)chlamydomonas has two flagella. C)each motile Chlamydomonas cell has a single haploid nucleus. D)chlamydomonas is photoautotrophic.