Exam 28: Protists

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 -A snail-like, coiled, porous test (shell)of calcium carbonate is characteristic of which group?

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?

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

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 -Which of the following is correctly described as a primary producer?

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?

Which statement regarding resistance is False?

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 -Thread-like pseudopods that can perform phagocytosis are generally characteristic of which group?

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 -Which taxon of eukaryotic organisms is thought to be directly ancestral to the plant kingdom?

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 -Similar to most amoebozoans, the forams and the radiolarians also have pseudopods, as do the white blood cells of animals. If one were to erect a taxon that included all organisms that have cells with pseudpods, what would be True of such a taxon?

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

Why is the filamentous morphology of the water molds considered a case of convergent evolution with the hyphae (threads)of fungi?

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 aquatic protist that is a primary producer. It cannot swim on its own, yet must stay in well-lit surface waters. It must be resistant to physical damage from wave action. It should be most similar to a(n)

Protists are alike in that all are

In test tube 1, you observe an organism feeding. Your sketch of the organism looks very similar to Figure 28.1. When light, especially red and blue light, is shone on the tubes, oxygen bubbles accumulate on the inside of test tubes 2 and 3. Chemical analysis of test tube 3 indicates the presence of substantial amounts of silica. Chemical analysis of test tube 2 indicates the presence of a chemical that is toxic to fish and humans. Microscopic analysis of organisms in tubes 2, 4, and 5 reveals the presence of permanent, membrane-bounded sacs just under the plasma membrane. Microscopic analysis of organisms in tube 4 reveals the presence of an apicoplast in each. Microscopic analysis of the contents in tube 5 reveals the presence of one large nucleus and several small nuclei in each organism. Figure 28.1 You are given five test tubes, each containing an unknown protist, and your task is to read the description below and match these five protists to the correct test tube. -Test tube 1 contains

In test tube 1, you observe an organism feeding. Your sketch of the organism looks very similar to Figure 28.1. When light, especially red and blue light, is shone on the tubes, oxygen bubbles accumulate on the inside of test tubes 2 and 3. Chemical analysis of test tube 3 indicates the presence of substantial amounts of silica. Chemical analysis of test tube 2 indicates the presence of a chemical that is toxic to fish and humans. Microscopic analysis of organisms in tubes 2, 4, and 5 reveals the presence of permanent, membrane-bounded sacs just under the plasma membrane. Microscopic analysis of organisms in tube 4 reveals the presence of an apicoplast in each. Microscopic analysis of the contents in tube 5 reveals the presence of one large nucleus and several small nuclei in each organism. Figure 28.1 You are given five test tubes, each containing an unknown protist, and your task is to read the description below and match these five protists to the correct test tube. -Test tube 3 contains

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 all of the following are derived from ancestral red algae, except those of

According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?

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 -Which of the following statements concerning protists is False?

Which of these was not derived from an ancestral alpha proteobacterium?

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 -Theoretically, which two of the following present the richest potential sources of silica? 1) marine sediments consisting of foram tests 2) marine sediments consisting of diatom cases (valves) 3) marine sediments consisting of radiolarian shells 4) marine sediments consisting of dinoflagellate plates