Question 1

According to Figure 27.1, which of the following statements about the evolution of eukaryotes is true?

Accepted Answer

A)  The alveolates are more closely related to the stramenopiles than to any other group. 
B)  The most recent common ancestor of the parabasilids and euglenoids also gave rise to the animals. 
C)  The red algae are more closely related to the brown algae than they are to any other taxon. 
D)  The opisthokonts are polyphyletic. 
E)  Euglenids and Cercozoans are subgroups of the clade Rhizaria. 
A)  The alveolates are more closely related to the stramenopiles than to any other group. 
B)  The most recent common ancestor of the parabasilids and euglenoids also gave rise to the animals. 
C)  The red algae are more closely related to the brown algae than they are to any other taxon. 
D)  The opisthokonts are polyphyletic. 
E)  Euglenids and Cercozoans are subgroups of the clade Rhizaria.

Question 2

Which of the following groups may not be monophyletic?

Accepted Answer

A)  Opisthokonts 
B)  Plantae 
C)  Chromalveolates 
D)  Stramenopiles 
E)  Excavates 
A)  Opisthokonts 
B)  Plantae 
C)  Chromalveolates 
D)  Stramenopiles 
E)  Excavates

Question 3

Paramecia have an elaborate sexual behavior called _______ in which sexual recombination, but not sexual reproduction, occurs.

Accepted Answer

The answer of Paramecia have an elaborate sexual behavior called...

Question 4

Which of the following statements about the life cycle of the green alga Ulva is false?

Accepted Answer

A)  Ulva has an isomorphic life cycle. 
B)  The sporophyte and gametophyte can be differentiated only microscopically. 
C)  All species of Ulva are isogamous. 
D)  Individual gametophytes produce only sperm or only eggs-never both. 
E)  The diploid sporophyte produces flagellated spores. 
A)  Ulva has an isomorphic life cycle. 
B)  The sporophyte and gametophyte can be differentiated only microscopically. 
C)  All species of Ulva are isogamous. 
D)  Individual gametophytes produce only sperm or only eggs-never both. 
E)  The diploid sporophyte produces flagellated spores.

Question 5

In species that are anisogamous,

Accepted Answer

A)  both male and female gametes are very large. 
B)  both male and female gametes are microscopic in size. 
C)  male and female gametes are the same size. 
D)  male gametes are larger than female gametes. 
E)  female gametes are larger than male gametes. 
A)  both male and female gametes are very large. 
B)  both male and female gametes are microscopic in size. 
C)  male and female gametes are the same size. 
D)  male gametes are larger than female gametes. 
E)  female gametes are larger than male gametes.

Question 6

Which of the following groups uses pseudopods for locomotion?

Accepted Answer

A)  Radiolarians 
B)  Amoebozoans 
C)  Euglenids 
D)  Both a and b 
E)  Both a and c 
A)  Radiolarians 
B)  Amoebozoans 
C)  Euglenids 
D)  Both a and b 
E)  Both a and c

Question 7

Oomycetes resemble green plants in that

Accepted Answer

A)  they are photosynthetic. 
B)  they are related to fungi. 
C)  they have flagellated reproductive cells. 
D)  they have cellulose in their cell walls. 
E)  many are saprobic. 
A)  they are photosynthetic. 
B)  they are related to fungi. 
C)  they have flagellated reproductive cells. 
D)  they have cellulose in their cell walls. 
E)  many are saprobic.

Question 8

Which of the following statements regarding protists is true in general?

Accepted Answer

A)  Protists are always parasitic. 
B)  Protists are all single celled. 
C)  Protists are all heterotrophic. 
D)  Protists are always photosynthetic. 
E)  Protists are always aquatic, at least on a small scale. 
A)  Protists are always parasitic. 
B)  Protists are all single celled. 
C)  Protists are all heterotrophic. 
D)  Protists are always photosynthetic. 
E)  Protists are always aquatic, at least on a small scale.

Question 9

Two different species of ciliate are placed in a solution with an unknown solute concentration. Ciliate A has a contractile vacuole firing rate of 5 per minute; ciliate B has a contractile vacuole firing rate of 12 per minute. Which of the following is a reasonable conclusion based on these observations?

Accepted Answer

A)  Ciliate A has a greater solute concentration than ciliate B. 
B)  Ciliate B has a greater solute concentration than ciliate A. 
C)  The solution has a greater solute concentration than ciliate A. 
D)  The solution has a greater solute concentration than ciliate B. 
E)  No conclusions can be made unless we know the solute concentration of the solution. 
A)  Ciliate A has a greater solute concentration than ciliate B. 
B)  Ciliate B has a greater solute concentration than ciliate A. 
C)  The solution has a greater solute concentration than ciliate A. 
D)  The solution has a greater solute concentration than ciliate B. 
E)  No conclusions can be made unless we know the solute concentration of the solution.

Question 10

The presence of _______ in the chloroplasts of red algae gives them their characteristic color.

Accepted Answer

A)  phycoerythrin 
B)  fucoxanthin 
C)  $\beta$-carotene 
D)  chrysolaminarin 
E)  chlorophyll b 
A)  phycoerythrin 
B)  fucoxanthin 
C)  $\beta$-carotene 
D)  chrysolaminarin 
E)  chlorophyll b

Question 11

The common sea lettuce, Ulva lactuca, is said to have an isomorphic life cycle. Which of the following statements about this species is true?

Accepted Answer

A)  The sporophyte and the gametophyte look virtually identical. 
B)  The diploid and haploid stages of the life cycle are morphologically different from each other. 
C)  The male and female gametes are different sizes. 
D)  All of the above 
E)  None of the above 
A)  The sporophyte and the gametophyte look virtually identical. 
B)  The diploid and haploid stages of the life cycle are morphologically different from each other. 
C)  The male and female gametes are different sizes. 
D)  All of the above 
E)  None of the above

Question 12

Which of the following statements about Chlorophytes is false?

Accepted Answer

A)  They are the only green algal clade. 
B)  They vary in size from microscopic to macroscopic. 
C)  Volvox species are chlorophytes. 
D)  They may be motile. 
E)  Most Chlorophytes are aquatic. 
A)  They are the only green algal clade. 
B)  They vary in size from microscopic to macroscopic. 
C)  Volvox species are chlorophytes. 
D)  They may be motile. 
E)  Most Chlorophytes are aquatic.

Question 13

Which of the following organisms lack mitochondria?

Accepted Answer

A)  Diplomonads 
B)  Choanoflagellates 
C)  Red algae 
D)  Euglenozoans 
E)  Both b and c 
A)  Diplomonads 
B)  Choanoflagellates 
C)  Red algae 
D)  Euglenozoans 
E)  Both b and c

Question 14

The three groups of rhizaria include the _______, _______, and _______.

Accepted Answer

cercozoans

Question 15

Which clade of eukaryotes includes groups that do not have mitochondria?

Accepted Answer

A)  Chromalveolates 
B)  Plantae 
C)  Excavates 
D)  Rhizaria 
E)  Unikonts 
A)  Chromalveolates 
B)  Plantae 
C)  Excavates 
D)  Rhizaria 
E)  Unikonts

Question 16

The causative agent of African sleeping sickness is _______, a parasitic kinetoplastid excavate.

Accepted Answer

The answer of The causative agent of African sleeping sickness...

Question 17

The _______, members of the phytoplankton, perform as much photosynthesis as all of Earth's rainforests.

Accepted Answer

A)  radiolarians 
B)  stramenopiles 
C)  dinoflagellates 
D)  diatoms 
E)  None of the above 
A)  radiolarians 
B)  stramenopiles 
C)  dinoflagellates 
D)  diatoms 
E)  None of the above

Question 18

Some algae demonstrate the phenomenon of alternation of generations, by which a multicellular, diploid, spore-producing organism gives rise to a multicellular, haploid, gamete-producing organism. Which of the following statements about alternation of generations is false?

Accepted Answer

A)  The haploid and diploid organisms may or may not differ morphologically. 
B)  The haploid and diploid organisms differ genetically. 
C)  Only the haploid organism may also reproduce asexually. 
D)  Haploid gametes can produce new organisms only by fusing with other gametes. 
E)  Diploid sporophytes may undergo meiosis to produce haploid spores. 
A)  The haploid and diploid organisms may or may not differ morphologically. 
B)  The haploid and diploid organisms differ genetically. 
C)  Only the haploid organism may also reproduce asexually. 
D)  Haploid gametes can produce new organisms only by fusing with other gametes. 
E)  Diploid sporophytes may undergo meiosis to produce haploid spores.

Question 19

The many organisms designated as "protists" or "microbial eukaryotes" are

Accepted Answer

A)  closely related to the bacteria. 
B)  highly diverse and not necessarily closely related to one another. 
C)  part of a monophyletic clade. 
D)  all unicellular. 
E)  all microscopic. 
A)  closely related to the bacteria. 
B)  highly diverse and not necessarily closely related to one another. 
C)  part of a monophyletic clade. 
D)  all unicellular. 
E)  all microscopic.

Question 20

In the cellular slime molds, the onset of adverse conditions causes

Accepted Answer

A)  aggregation of swarm cells to form a plasmodium. 
B)  formation of sporangia. 
C)  release of myxamoebas from fruiting bodies. 
D)  the onset of cytoplasmic streaming. 
E)  aggregation of myxamoebas to form a slug or pseudoplasmodium. 
A)  aggregation of swarm cells to form a plasmodium. 
B)  formation of sporangia. 
C)  release of myxamoebas from fruiting bodies. 
D)  the onset of cytoplasmic streaming. 
E)  aggregation of myxamoebas to form a slug or pseudoplasmodium.

Exam 27: The Origin and Diversification of Eukaryotes

According to Figure 27.1, which of the following statements about the evolution of eukaryotes is true?

Which of the following groups may not be monophyletic?

Paramecia have an elaborate sexual behavior called _______ in which sexual recombination, but not sexual reproduction, occurs.

Which of the following statements about the life cycle of the green alga Ulva is false?

In species that are anisogamous,

Which of the following groups uses pseudopods for locomotion?

Oomycetes resemble green plants in that

Which of the following statements regarding protists is true in general?

The presence of _______ in the chloroplasts of red algae gives them their characteristic color.

The common sea lettuce, Ulva lactuca, is said to have an isomorphic life cycle. Which of the following statements about this species is true?

Which of the following statements about Chlorophytes is false?

Which of the following organisms lack mitochondria?

The three groups of rhizaria include the _______, _______, and _______.

Which clade of eukaryotes includes groups that do not have mitochondria?

The causative agent of African sleeping sickness is _______, a parasitic kinetoplastid excavate.

The _______, members of the phytoplankton, perform as much photosynthesis as all of Earth's rainforests.

Some algae demonstrate the phenomenon of alternation of generations, by which a multicellular, diploid, spore-producing organism gives rise to a multicellular, haploid, gamete-producing organism. Which of the following statements about alternation of generations is false?

The many organisms designated as "protists" or "microbial eukaryotes" are

In the cellular slime molds, the onset of adverse conditions causes

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