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Exam 17: Protists

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Question 31

Multiple Choice

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African sleeping sickness is caused by Trypanosoma brucei,a unicellular flagellated protist infects red blood cells after being injected into the blood stream.Trypanosoma brucei is which of the following?

A) An algae
B) A protozoa
C) A slime mold
D) A diatom
E) An apicomplexan

F) A) and B)
G) A) and C)

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Question 32

Multiple Choice

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In addition to visual comparison,which of the following would be the best way to determine that S.niagarae and S.yellowstonensis are separate species?

A) Look for the presence of chloroplasts
B) By the presence of a silica shell
C) By their location in different lakes
D) Compare their DNA sequences
E) Carbon date them

F) C) and D)
G) None of the above

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Question 33

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Protists can be autotrophs.

As more CO₂ is released into the atmosphere,which of the following would you predict may happen to S.yellowstonensis diatoms in Yellowstone Lake?

Dictyostelium discoideum is an unusual organism,one that straddles the boundary between the unicellular and the multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria by phagocytosis.When the food runs out,cells begin to aggregate into a multicelled structure that migrates toward light.The cells differentiate into a base,stalk,and spores; only the spores survive to colonize a new habitat.Dictyostelium discoideum is which of the following?

Which of the following is a difference between a diatom and a lodgepole pine?

Dictyostelium discoideum is an unusual organism,one that straddles the boundary between the unicellular and the multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria by phagocytosis.When the food runs out,cells begin to aggregate into a multicelled structure that migrates toward light.The cells differentiate into a base,stalk,and spores; only the spores survive to colonize a new habitat.Dictyostelium discoideum is which of the following?

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferans are an example of which of the following?

Which protists produce most of the Earth's oxygen?

A jellylike substance produced by red marine algae and used as a culture medium for microorganisms is:

A protective layer made of rigid or elastic protein strips surrounding the cell membrane of euglenoids is a:

Slime molds may exist as either single amoeboid cells or large masses of cells that behave as one multicellular organism.

Water molds are unlike fungi in that water molds have diploid filaments and cell walls containing cellulose; whereas fungi have haploid filaments and cell walls containing chitin.

Mitochondria in algae are thought to have arisen from which source?

Malaria is caused by Plasmodium falciparum,a non-motile protist that contains a cluster of microtubules at one end of the cell.Once injected into the blood stream,these microtubules are used to attach to red blood cells.Plasmodium falciparum is which of the following?

Spines increase a cell's surface area,so the spiniest diatoms should be the most buoyant.Which selective force below might explain the observed shift in spine number?

Protists can be heterotrophs.

Where in a diatom would you find their yellowish photosynthetic pigment?

Termites could not digest wood without protists and bacteria living within them.