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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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