16 Jun The Origin and Diversification of Eukaryotes
vQuestion
Name ______________________________
Date ___________
Period __
.jpg” alt=”http://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Eukaryota_diversity_2.jpg/220px-Eukaryota_diversity_2.jpg”>Chapter 20 – The Origin and Diversification of Eukaryotes
Review Questions
20.1 Eukaryotes Acquired Features from Both Archaea and Bacteria
1. Why was the development of a flexible cell surface a key event for eukaryote evolution?
2. Explain how increased availability of atmospheric oxygen (O2) could have impacted the evolution of the
eukaryotic cell.
20.2 Major Lineages of Eukaryotes Diversified in the Precambrian
3. Explain why the term “protists” does not refer to a formal taxonomic group.
4. Contrast the major distinctive features of alveolates, excavates, stramenopiles, rhizaria, and amoebozoans.
5. The fossil record of eukaryotes in the Precambrian is poor compared with those of the Cambrian and later
geological periods, even though eukaryotes were diversifying for the last billion years of the Precambrian.
Can you think of some possible reasons for the better fossil record beginning in the Cambrian?
20.3 Protists Reproduce Sexually and Asexually
6. Why is conjugation between paramecia considered a sexual process but not a reproductive process?
7. Although most diploid animals have haploid stages (for example, eggs and sperm), their life cycles are not
considered alternation of generations. Why not?
20.4 Protists Are Critical Components of Many Ecosystems
8. What is the role of female Anopheles mosquitoes in the transmission of malaria?
9. Explain the role of dinoflagellates in the two very different phenomena of coral bleaching and red tides.
10. What are some of the ways in which diatoms are important to human society?Question
Name ______________________________
Date ___________
Period __
.jpg” alt=”http://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Eukaryota_diversity_2.jpg/220px-Eukaryota_diversity_2.jpg”>Chapter 20 – The Origin and Diversification of Eukaryotes
Review Questions
20.1 Eukaryotes Acquired Features from Both Archaea and Bacteria
1. Why was the development of a flexible cell surface a key event for eukaryote evolution?
2. Explain how increased availability of atmospheric oxygen (O2) could have impacted the evolution of the
eukaryotic cell.
20.2 Major Lineages of Eukaryotes Diversified in the Precambrian
3. Explain why the term “protists” does not refer to a formal taxonomic group.
4. Contrast the major distinctive features of alveolates, excavates, stramenopiles, rhizaria, and amoebozoans.
5. The fossil record of eukaryotes in the Precambrian is poor compared with those of the Cambrian and later
geological periods, even though eukaryotes were diversifying for the last billion years of the Precambrian.
Can you think of some possible reasons for the better fossil record beginning in the Cambrian?
20.3 Protists Reproduce Sexually and Asexually
6. Why is conjugation between paramecia considered a sexual process but not a reproductive process?
7. Although most diploid animals have haploid stages (for example, eggs and sperm), their life cycles are not
considered alternation of generations. Why not?
20.4 Protists Are Critical Components of Many Ecosystems
8. What is the role of female Anopheles mosquitoes in the transmission of malaria?
9. Explain the role of dinoflagellates in the two very different phenomena of coral bleaching and red tides.
10. What are some of the ways in which diatoms are important to human society?
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