Exam 28: Protists

The following data were collected two weeks following reintroduction of Chlorella. (NOTE: "Native" refers to Chlorella originally taken from P. bursaria cytoplasm.) Figure 28.2: Abundance of zoochlorellae in P. bursaria cytoplasm two weeks after reintroduction -The researchers decided to perform the same experiment over again, only this time, withdrawing P. bursaria samples every other day for testing to get a better picture of the fate of each Chlorella strain over time. Which graph below is most consistent with the results depicted in Figure 28.2, assuming that P. bursaria ingests the various Chlorella strains indiscriminately? Key: $\text { Native}$ $\quad$$\text { Other Protists }$ $\quad$$\text { Free-living }$

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -What makes certain red algae appear red?

Which of the following pairs of protists and their characteristics is mismatched?

Which of these taxa contains species that produce potent toxins that can cause extensive fish kills, contaminate shellfish, and poison humans?

The following are all characteristic of the water molds (oomycetes)except

You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of the cytoplasm, each featuring the 9+2 filament pattern. It has well-developed organelles and three nuclei, one large and two small. This organism is most likely to be a member of which group?

Biologists suspect that endosymbiosis gave rise to mitochondria before plastids partly because

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -If the Archaeplastidae are eventually designated a kingdom, and if the land plants are excluded from this kingdom, then what will be True of this new kingdom?

The following data were collected two weeks following reintroduction of Chlorella. (NOTE: "Native" refers to Chlorella originally taken from P. bursaria cytoplasm.) Figure 28.2: Abundance of zoochlorellae in P. bursaria cytoplasm two weeks after reintroduction -Which conclusion is consistent with the data presented in Figure 28.2 above?

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -Judging from Table 28.1 and given that water's density and, consequently, its buoyancy decrease at warmer temperatures, in which environment should diatoms (and other suspended particles)sink most slowly?

An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival?

Biologists have long been aware that the defunct kingdom Protista is paraphyletic. Which of these statements is both True and consistent with this conclusion?

Which group includes members that are important primary producers in ocean food webs, causes red tides that kill many fish, and may even be carnivorous?

If one were to apply the most recent technique used to fight potato late blight to the fight against the malarial infection of humans, then one would

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -The best evidence for not classifying the slime molds as fungi comes from slime molds'

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

Which group is incorrectly paired with its description?

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -You are given the task of designing an aerobic, mixotrophic protist that can perform photosynthesis in fairly deep water (e.g., 250 m deep), and can also crawl about and engulf small particles. With which two of these structures would you provide your protist? 1) hydrogenosome 2) apicoplast 3) pseudopods 4) chloroplast from red alga 5) chloroplast from green alga

The following questions refer to the description and Table 28.1 below. Diatoms are encased in Petri-plate-like 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. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment. Table 28.1: Specific Gravities of Materials Relevant to Diatoms Material Specific Gravity (//) Pure water 1000 Seawater 1026 Hydrated silica 2250 Liquid laminarin 1500 Diatom oil 910 -Green algae often differ from land plants in that some green algae