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Protists

Discover the fascinating world of protists through a series of thought-provoking questions prepared by experts from Louisiana State University and Texas Tech University. Learn about slime molds, photosynthetic eukaryotes, amoeboid distribution, and the challenges faced by diatoms. Delve into the evolution of eukaryotic organisms and the impact of red tides on marine ecosystems.

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Protists

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  1. Chapter 28 Protists Questions prepared by William WischusenLouisiana State University Michael DiniTexas Tech University

  2. Which of the following is a correct statement about slime molds? • a) Cellular slime molds have haploid zygotes. • b) Cytoplasmic streaming helps distribute nutrients and oxygen in cellular slime molds • c) In plasmodial slime molds, the haploid condition is the dominant part of the life cycle. • d) Cellular slime molds have fruiting bodies that function in sexual reproduction. • e) Cellular slime molds form masses when food is scarce, but their cells remain separated.

  3. The greatest number of eukaryotic organisms are • vertebrates. • animals. • plants. • protists. • fungi.

  4. Photosynthetic eukaryotes contain both mitochondria and chloroplasts. Which sequence most likely describes the evolution of this group? • Ancestral anaerobic prokaryote engulfs heterotrophic prokaryote, then engulfs photosynthetic prokaryote. • Ancestral anaerobic prokaryote engulfs photosynthetic prokaryote, then engulfs heterotrophic prokaryote. • Both sequences are equally likely.

  5. The amoeboid condition is widely distributed among unrelated eukaryotic taxa. The best explanation for this seems to be • homology. • convergence. • horizontal gene transfer.

  6. Hydrogenosomes, nucleomorphs, mitosomes, and kinetoplasts are all evidence of • endocytosis. • serial endosymbiosis. • endosymbiosis. • exocytosis. • vertical gene transfer.

  7. Diatoms are members of the phytoplankton, are surrounded by relatively dense silica cases, and lack flagella. Consequently, what is their greatest challenge to survival?

  8. Red tides can cause massive fish kills. One reason may be that red-tide organisms secrete deadly neurotoxins. Another reason is less direct. What might it be? (HINT: What happens to the bloom when the conditions that caused it to occur are no longer present?)

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