Question 1

Unikonta is a supergroup that includes all of the following except ________.

Accepted Answer

A)  fungi
B)  protists
C)  animals
D)  plantsE) All of the above
F) A) and D)

Question 2

Which of the following groups is matched with a correct anatomical feature?

Accepted Answer

A)  foraminifera → silicon-rich tests
B)  dinoflagellata → holdfast
C)  diatoms → tests made of cellulose
D)  phaeophyta (brown algae) → bladeE) A) and B)
F) All of the above

Question 3

The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?

Accepted Answer

A)  cyanobacteria → green algae → land plants
B)  cyanobacteria → green algae → fungi → land plants
C)  red algae → brown algae → green algae → land plants
D)  cyanobacteria → red algae → green algae → land plantsE) C) and D)
F) All of the above

Question 4

If the mitosomes of Giardia contain no DNA,yet are descendants of what were once free-living organisms,then where are we likely to find the genes that encode their structures,and what accounts for their current location there?

Accepted Answer

A)  plasmids; conjugation
B)  plasmids; transformation
C)  nucleus; horizontal gene transfer
D)  nucleus; S phaseE) A) and C)
F) All of the above

Question 5

Diatoms are mostly asexual members of the phytoplankton.Diatoms lack any organelles that might have the 9 + 2 pattern.They obtain their nutrition from functional chloroplasts,and each diatom is encased within two porous,glasslike valves.Which question would be most important for one interested in the day-to-day survival of individual diatoms?

Accepted Answer

A)  How does carbon dioxide get into these protists with their glasslike valves?
B)  How do diatoms get transported from one location on the water's surface layers to another location on the surface?
C)  How do diatoms with their glasslike valves keep from sinking into poorly lit waters?
D)  How do diatoms with their glasslike valves avoid being shattered by the action of waves?
E)  How do diatom sperm cells locate diatom egg cells?F) A) and E)
G) None of the above

Question 6

A biologist discovers an alga that is marine,multicellular,and lives at a depth reached only by blue light.This alga probably belongs to which group?

Accepted Answer

A)  red algae
B)  brown algae
C)  green algae
D)  dinoflagellates
E)  golden algaeF) A) and B)
G) None of the above

Question 7

Which process results in genetic recombination,but is separate from the process by which the population size of Paramecium increases?

Accepted Answer

A)  budding
B)  meiotic division
C)  mitotic division
D)  conjugation
E)  binary fissionF) A) and E)
G) A) and D)

Question 8

The next few questions refer to the following description and table.
Diatoms are encased in Petri-platelike cases (valves) made of translucent hydrated silica whose thickness can be varied.The material used to store excess calories can also be varied.At certain times,diatoms store excess calories in the form of the liquid polysaccharide,laminarin,and at other times as oil.The following are data concerning the density (specific gravity) of various components of diatoms,and of their environment.
Specific Gravities of Materials Relevant to Diatoms
 
-Using dead diatoms to "pump" CO₂ to the seafloor is feasible only if dead diatoms sink quickly.Consequently,application of mineral fertilizers,such as iron,should be most effective at times when diatom valves

Accepted Answer

A)  are thickest, and laminarin is being produced rather than oil.
B)  are thickest, and oil is being produced rather than laminarin.
C)  are thinnest, and laminarin is being produced rather than oil.
D)  are thinnest, and oil is being produced rather than laminarin.E) C) and D)
F) A) and B)

Question 9

Which protists are in the same eukaryotic supergroup as land plants?

Accepted Answer

A)  green algae
B)  dinoflagellates
C)  red algae
D)  brown algae
E)  both green algae and red algaeF) B) and D)
G) B) and E)

Question 10

Which of the following statements about dinoflagellates is true?

Accepted Answer

A)  They possess two flagella.
B)  All known varieties are autotrophic.
C)  Their walls are usually composed of silica plates.
D)  Many types lack mitochondria.
E)  Their dead cells accumulate on the seafloor, and are mined to serve as a filtering material.F) None of the above
G) A) and B)

Question 11

Which term best describes the symbiotic relationship of well-fed P.bursaria to their zoochlorellae?

Accepted Answer

A)  mutualistic
B)  commensal
C)  parasitic
D)  predatory
E)  pathogenicF) A) and E)
G) All of the above

Question 12

Living diatoms contain brownish plastids.If global warming causes blooms of diatoms in the surface waters of Earth's oceans,how might this be harmful to the animals that build coral reefs?

Accepted Answer

A)  The coral animals, which capture planktonic organisms, may be outcompeted by the diatoms.
B)  The coral animals' endosymbiotic dinoflagellates may get "shaded out" by the diatoms.
C)  The coral animals may die from overeating the plentiful diatoms, with their cases of silica.
D)  The diatoms' photosynthetic output may over-oxygenate the water.E) A) and C)
F) A) and D)

Question 13

Given its mode of reproduction and internal structures,which of the following should be expected to occur in Giardia at some stage of its life cycle?
1) separation (segregation) of daughter chromosomes
2) crossing over
3) meiosis

Accepted Answer

A)  1 only
B)  3 only
C)  1 and 2
D)  1 and 3
E)  2 and 3F) B) and E)
G) A) and E)

Question 14

The motility that permits P.bursaria to move toward a light source is provided by

Accepted Answer

A)  pseudopods.
B)  a single flagellum composed of the protein, flagellin.
C)  a single flagellum featuring the 9 + 2 pattern.
D)  many cilia.
E)  contractile vacuoles.F) B) and D)
G) A) and D)

Question 15

Unlike most excavates,Giardia trophozoites have no oral groove and are unable to form food vacuoles.Thus,we should expect its nutrition (mostly glucose) to come from

Accepted Answer

A)  its mitosomes.
B)  endosymbiotic cyanobacteria.
C)  the ventral disk by which it adheres to the intestinal lining.
D)  osmosis involving aquaporins.
E)  plasma membrane proteins that are transporters or pumps.F) All of the above
G) C) and E)

Question 16

Which group is incorrectly paired with its description?

Accepted Answer

A)  rhizarians-morphologically diverse group defined by DNA similarities
B)  diatoms-important producers in aquatic communities
C)  red algae-acquired plastids by secondary endosymbiosis
D)  apicomplexans-parasites with intricate life cycles
E)  diplomonads-protists with modified mitochondriaF) A) and E)
G) A) and B)

Question 17

The following questions refer to the description below.
Malaria is a global health problem in over 100 countries,killing about one million people every year.The protist,Plasmodium,that causes malaria lives in 2 hosts,mosquitoes and humans.Malaria is transmitted to humans by the Anopholes mosquito.
-A friend of yours has just returned from central Africa and has told you that she is sick with malaria.You know your friend took an anti-malaria medication before she left on her trip.How can you explain why your friend contracted malaria?

Accepted Answer

A)  Your friend has likely picked up a new pathogen which is making her sick.
B)  Your friend had taken anti-malaria medication, but the Plasmodium parasite was resistant to this drug.
C)  The medication suppressed your friend's immune system.
D)  Your friend is immune to the medication she took.
E)  Your friend should have chosen a vaccine instead of drugs because vaccines work for a longer period of time.F) C) and D)
G) A) and C)

Question 18

A P.bursaria cell that has lost its zoochlorellae is aposymbiotic.If aposymbiotic cells have population growth rates the same as those of healthy,zoochlorella-containing P.bursaria in well-lit environments with plenty of prey items,then such an observation would be consistent with which type of relationship?

Accepted Answer

A)  parasitic
B)  commensalistic
C)  toxic
D)  predator-prey
E)  mutualisticF) A) and D)
G) B) and C)

Question 19

The following questions refer to the description below.
Malaria is a global health problem in over 100 countries,killing about one million people every year.The protist,Plasmodium,that causes malaria lives in 2 hosts,mosquitoes and humans.Malaria is transmitted to humans by the Anopholes mosquito.
-The use of DDT greatly decreased numbers of Anopholes mosquitoes in the 1960s,and drugs killed the Plasmodium.Now doctors tend to prescribe a combination of drugs against malaria.Why don't doctors prescribe a vaccine to combat malaria?

Accepted Answer

A)  In the presence of multiple drugs, the mutation rate of pathogens decreases.
B)  Multiple drugs enhance the immune system better than vaccines.
C)  Making an effective vaccine has proved to be difficult because Plasmodium lives inside the host's cells and continually changes its surface proteins.
D)  There are fewer side effects associated with using a combination of drugs compared with using a vaccine.
E)  Vaccines are more expensive than many drugs.F) A) and D)
G) B) and C)

Question 20

If true,which of the following would be most important in determining whether P.chromatophora's cyanelle is still an endosymbiont,or is an organelle,as the term cyanelle implies?

Accepted Answer

A)  if P. chromatophora is less fit without its cyanelle than with it
B)  if the cyanelle is less fit without the host cercozoan than with it
C)  if there is ongoing metabolic cooperation between the cyanelle and the host cercozoan
D)  if the magnesium-containing porphyrin ring in the cyanelle's chlorophyll molecules is built by the cyanelle, whereas the organic portion of the chlorophyll molecules is built by the host cercozoan
E)  if there has been movement of genes from the cyanelle genome to the nuclear genome, such that these genes are no longer present in the cyanelle genomeF) B) and D)
G) B) and C)

Exam 28: Protists

Which protists are in the same eukaryotic supergroup as land plants?

Correct Answer
verified

A biologist discovers an alga that is marine,multicellular,and lives at a depth reached only by blue light.This alga probably belongs to which group?

Correct Answer
verified

Which group is incorrectly paired with its description?

Correct Answer
verified

If the mitosomes of Giardia contain no DNA,yet are descendants of what were once free-living organisms,then where are we likely to find the genes that encode their structures,and what accounts for their current location there?

Correct Answer
verified

Which of the following groups is matched with a correct anatomical feature?

Correct Answer
verified

Which of the following statements about dinoflagellates is true?

Correct Answer
verified

Correct Answer
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Which process results in genetic recombination,but is separate from the process by which the population size of Paramecium increases?

Correct Answer
verified

Unikonta is a supergroup that includes all of the following except ________.

Correct Answer
verified

Given its mode of reproduction and internal structures,which of the following should be expected to occur in Giardia at some stage of its life cycle? 1) separation (segregation) of daughter chromosomes 2) crossing over 3) meiosis

Correct Answer
verified

The motility that permits P.bursaria to move toward a light source is provided by

Correct Answer
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Correct Answer
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Correct Answer
verified

Which term best describes the symbiotic relationship of well-fed P.bursaria to their zoochlorellae?

Correct Answer
verified

Unlike most excavates,Giardia trophozoites have no oral groove and are unable to form food vacuoles.Thus,we should expect its nutrition (mostly glucose) to come from

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If true,which of the following would be most important in determining whether P.chromatophora's cyanelle is still an endosymbiont,or is an organelle,as the term cyanelle implies?

Correct Answer
verified

Living diatoms contain brownish plastids.If global warming causes blooms of diatoms in the surface waters of Earth's oceans,how might this be harmful to the animals that build coral reefs?

Correct Answer
verified

The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?

Correct Answer
verified

Exam 28: Protists

Which protists are in the same eukaryotic supergroup as land plants?

Correct AnswerverifiedShow Answer

A biologist discovers an alga that is marine,multicellular,and lives at a depth reached only by blue light.This alga probably belongs to which group?

Correct AnswerverifiedShow Answer

Which group is incorrectly paired with its description?

Correct AnswerverifiedShow Answer

If the mitosomes of Giardia contain no DNA,yet are descendants of what were once free-living organisms,then where are we likely to find the genes that encode their structures,and what accounts for their current location there?

Correct AnswerverifiedShow Answer

Which of the following groups is matched with a correct anatomical feature?

Correct AnswerverifiedShow Answer

Which of the following statements about dinoflagellates is true?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which process results in genetic recombination,but is separate from the process by which the population size of Paramecium increases?

Correct AnswerverifiedShow Answer

Unikonta is a supergroup that includes all of the following except ________.

Correct AnswerverifiedShow Answer

Given its mode of reproduction and internal structures,which of the following should be expected to occur in Giardia at some stage of its life cycle? 1) separation (segregation) of daughter chromosomes 2) crossing over 3) meiosis

Correct AnswerverifiedShow Answer

The motility that permits P.bursaria to move toward a light source is provided by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which term best describes the symbiotic relationship of well-fed P.bursaria to their zoochlorellae?

Correct AnswerverifiedShow Answer

Unlike most excavates,Giardia trophozoites have no oral groove and are unable to form food vacuoles.Thus,we should expect its nutrition (mostly glucose) to come from

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If true,which of the following would be most important in determining whether P.chromatophora's cyanelle is still an endosymbiont,or is an organelle,as the term cyanelle implies?

Correct AnswerverifiedShow Answer

Living diatoms contain brownish plastids.If global warming causes blooms of diatoms in the surface waters of Earth's oceans,how might this be harmful to the animals that build coral reefs?

Correct AnswerverifiedShow Answer

The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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