2 thousands of marine and aquatic species 3

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2. Thousands of marine and aquatic species. 3. Chlamydomonas is a model organism for the genetic and molecular study of photosynthesis and flagella. 4. One line of green algae is the ancestral line of land plants. Fig. 28.22 The Chlamydomonas life cycle. Is it haplontic, diplontic or diplohaplontic?
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Protists - 13 STUDY QUESTIONS – PROTISTS 1. What kingdom in the traditional five-kingdom system is most lacking in clear definition? Why is there a movement to split this group into several named clades? 2. What processes led to the development of eukaryotes from prokaryotes? 3. What is the difference between a spore and a gamete? 4. Many animals that get some of their nutrition from photosynthesis in their tissues. How can this be? 5. Why (evolutionarily) do some chloroplasts have more than two membranes? 6. Why doesn’t Homo sapiens qualify as having alternation of generations? 7. What are the advantages of compartmentalization in the eukaryotic cell? 8. Giardia lamblia , which lacks respiring mitochondria, is descended from a cell that did have mitochondria. (The evidence is genes from mitochondria that apparently have moved to the nucleus of Giardia 's ancestor, and the persistence in Giardia of a relictual mitochondrion called a hydrogenosome.) What kind of conditions might have selected for loss of the mitochondrion in this lineage? 9. Malaria is kills many people every year, but the disease is not immediately fatal – one can suffer from it for years. Might there be an advantage to the Plasmodium parasite to moderate its effects on the host? 10. You find a fungus growing on your crop of potato plants. What feature of the fungus, visible through a microscope, would suggest that it is an oomycete and not a true fungus? 11. Consider the asexual spores of the water mould in Fig. 28.17 of the text. Would the spores released from a single zoosporangium in the asexual phase be genetically identical? 12. What is the dispersal stage of the kelp Laminaria (Fig. 28.16)? Of the green alga Chlamydomonas (Fig. 28.22)? Questions from your text, Biology , 8/e: § p. 599, Questions 1, 2, 5, 6, 7.
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Protists - 14 Answers 1. The protists. They are being split up to make monophyletic groups, which are currently named as clades. 2. The processes are: 1) the invagination of the plasma membrane and the detachment of portions of it to form membrane-enclosed organelles; 2) the development of the cytoskeleton; 3) the endosymbiosis of bacteria to create the eukaryotic mitochondrion, plastid and peroxisome. 3. A spore is a cell specialized for dispersal and for the endurance of unfavourable conditions. (Exceptions: the megaspores and microspores of seed plants, which are retained by the parent sporophyte, are not dispersed; you will learn about this in the next section of the course.) A spore does not fuse with and combine its genes with another cell. A spore is capable of undergoing mitosis to produce a multicellular body or a population of vegetative unicells.
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