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Exam 29: Protists

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Question 21

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The data graphed in Figure 29.3 could be an artifact if latrunculin A kills this species of diatoms (i.e.,that may be why the cells are not moving) .Which of the following would be the best evidence that latrunculin A is not killing the cells?

A) When the toxin was washed off the culture,the cells began to move again.
B) There were still a small percentage of motile cells in the culture treated with the toxin.
C) Most of the cells in the control were moving,indicating that they were alive.
D) When the toxin was applied to another species of diatom,25% of them continued to move.

E) B) and D)
F) All of the above

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Question 22

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Phytoplankton is comprised of photosynthetic protists and bacteria.For the most part,humans do not consume phytoplankton.Why,then,are they important to humans?

A) They are food for many marine organisms that humans eat.
B) They release a lot of carbon dioxide into the atmosphere.
C) They cause serious illness in humans.
D) They are not important to humans.

E) B) and D)
F) All of the above

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Question 23

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Which of the following statements best describes the term synapomorphy?

How are algal blooms (red tides) typically harmful to humans?

Figure 29.1 Use the following information to answer the corresponding question(s) . Giardia intestinalis can cause disease in several different mammalian species, including humans. Giardia organisms (G. intestinalis) that infect humans are similar morphologically to those that infect other mammals; thus, they have been considered a single species, though other species in the Giardia genus infect other organisms. However, G. intestinalis has been divided into different subgroups based on their host and a few other characteristics. In 1999, a DNA sequence comparison study tested the hypothesis that these subgroups actually constitute different species. The following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis and a few other morphologically distinct species of Giardia. The researchers concluded that the subgroups of Giardia are sufficiently different from one another genetically that they could be considered different species. (T. Monis et al. 1999. Molecular systematics of the parasitic protozoan Giardia intestinalis. Mol. Biol. Evol. 16[9]:1135-44.) -According to the phylogenetic tree in the figure above,Giardia intestinalis constitutes a ________ group.

Imagine there are 25 different species of protists living in a tide pool.Some of these species reproduce both sexually and asexually,and some of them can reproduce only asexually.The pool gradually becomes infested with disease-causing viruses and bacteria.Which species are more likely to thrive in the changing environment?

What is meant by the term "high-selected" lines in the phytoplankton experiment?

Which of the following protists causes the human disease malaria?

Alternation of generations occurs in protists.Which of the following represents the correct sequence of events for this mode of reproduction?

A particular species of protist has obtained a chloroplast via secondary endosymbiosis.How can you tell?

By examining the phylogenetic tree diagrammed above,what conclusion can you draw about the species G.microti?

Which of the following movements are matched correctly with the appendage that facilitates that movement in protists?

What is the major distinguishing feature of Amoebozoa?

Which of the following best describes what scientists (the Bell research group) concluded about the effect of atmospheric CO₂ increases on phytoplankton's primary productivity?

The manufacture of which of the following products involves using materials that once belonged to a protist?

You isolate a previously undescribed protist species from the soil outside your residence.Which of the following technique(s) would provide useful data for describing,classifying,and naming this new species?