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Chapter 28



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

Which of the following statements is consistent with the hypothesis that certain eukaryotic organelles originated as prokaryotic endosymbionts? Such organelles
a.
are roughly the same size as bacteria.
b.
can be cultured on agar since they make all their own proteins.
c.
contain circular DNA molecules.
d.
have ribosomes that are similar to those of bacteria.
e.
A, C, and D
 

 2. 

The chloroplasts of modern plants are thought to have been derived according to which sequence?
a.
cyanobacteria chapter_28_files/i0030000.jpg green algae chapter_28_files/i0030001.jpg green plants
b.
cyanobacteria chapter_28_files/i0030002.jpg green algae chapter_28_files/i0030003.jpg fungi chapter_28_files/i0030004.jpg green plants
c.
red algae chapter_28_files/i0030005.jpg brown algae chapter_28_files/i0030006.jpg green algae chapter_28_files/i0030007.jpg green plants
d.
red algae chapter_28_files/i0030008.jpg cyanobacteria chapter_28_files/i0030009.jpg green plants
e.
cyanobacteria chapter_28_files/i0030010.jpg red algae chapter_28_files/i0030011.jpg green algae chapter_28_files/i0030012.jpg green plants
 

 3. 

A mixotroph loses its plastids yet continues to survive. Which of the following most likely accounts for its continued survival?
a.
It relies on photosystems that float freely in its cytosol.
b.
It must have gained extra mitochondria when it lost its plastids.
c.
It engulfs organic material by phagocytosis.
d.
It has an endospore.
e.
It is protected by a siliceous case.
 

 4. 

Which two genera have members that can evade the human immune system by frequently changing their surface proteins?
1.
Plasmodium
2.
Trichomonas
3.
Paramecium
4.
Trypanosoma
5.
Entamoeba
a.
1 and 2
b.
1 and 4
c.
2 and 3
d.
2 and 4
e.
4 and 5
 

 5. 

Which of the following statements about dinoflagellates is false?
a.
They possess two flagella.
b.
Some cause red tides.
c.
their walls are composed of cellulose plates.
d.
Many types contain chlorophyll.
e.
Their fossil remains form limestone deposits.
 

 6. 

Which group(s) within the Alveolata include(s) members that are important in ocean food webs, cause(s) red tides that kill many fish, and may even be carnivorous?
a.
ciliates
b.
apicomplexans
c.
dinoflagellates
d.
A and B only
e.
A, B, and C
 

 7. 

Which of the following statements concerning protists is false?
a.
All protists are eukaryotic organisms; many are unicellular or colonial.
b.
The organism that causes malaria is transmitted to humans by the bite of the tsetse fly.
c.
All apicomplexans are parasitic.
d.
Cellular slime molds have an amoeboid stage that may be followed by a stage during which spores are produced.
e.
The euglenozoans that are functionally mixotrophic contain chloroplasts.
 

 8. 

If one speculates that it requires ten times as many ATP molecules to power a typical flagellum as to power a typical cilium for a given unit of time, and if one assumes that locomotion is the largest energy drain for protists, then which protist should have the largest number of ATP synthases per cell?
a.
Euglena
b.
Chlamydomonas
c.
Giardia
d.
Plasmodium
e.
Paramecium
 

 9. 

Why is the filamentous morphology of the water molds considered a case of convergent evolution with the hyphae of fungi?
a.
Fungi are closely related to the water molds.
b.
Body shape reflects ancestor-descendant relationships among organisms.
c.
Filamentous shape is an adaptation for a nutritional mode as a decomposer.
d.
Hyphae and filaments are necessary for locomotion in both groups.
e.
Filamentous body shape is evolutionarily primitive for all eukaryotes.
 

 10. 

If one were to apply the most recent technique used to fight late potato blight to the fight against the malarial infection of humans, then one would
a.
increase the dosage of the least-expensive antimalarial drug administered to humans.
b.
increase the dosage of the most common pesticide used to kill Anopheles mosquitoes.
c.
introduce a predator of the malarial parasite into infected humans.
d.
use a "cocktail" of at least three different pesticides against Anopheles mosquitoes.
e.
insert genes from a Plasmodium-resistant strain of mosquito into Anopheles mosquitoes.
 

 11. 

Which of the following is correctly described as a primary producer?
a.
oomycete
b.
kinetoplastid
c.
apicomplexan
d.
diatom
e.
radiolarian
 

 12. 

A large seaweed that floats freely on the surface of deep bodies of water would be expected to lack which of the following?
a.
thalli
b.
bladders
c.
blades
d.
holdfasts
e.
gel-forming polysaccharides
 

 13. 

A snail-like, coiled, porous shell of calcium carbonate is characteristic of which group?
a.
diatoms
b.
foraminiferans
c.
radiolarians
d.
gymnamoebas
e.
ciliates
 

 14. 

Which dichotomous pair of alternatives is highlighted by the life cycle of the cellular slime molds?
a.
prokaryotic versus eukaryotic
b.
plant versus animal
c.
unicellular versus multicellular
d.
diploid versus haploid
e.
autotroph versus heterotroph
 

 15. 

Members of the green algae often differ from members of the plant kingdom in that some green algae
a.
are heterotrophs.
b.
are unicellular.
c.
have chlorophyll a.
d.
store carbohydrates as starch.
e.
have cell walls containing cellulose.
 



 
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