SQ02_Lect_4_6 - BioMI 290 2/1/08 Study Questions #2...

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BioMI 290 2/1/08 Study Questions #2 Lectures 4 -6 Part I. The Big Tree of Life 1) What is a molecular chronometer? List the desired characteristics of a “good” molecular chronometer. 2) Why is it important to have both variable and constant regions in the sequence of a molecular chronometer? If you were comparing two distantly related organisms, would you want the sequences to be relatively constant, or highly variable? 3) Explain why small subunit ribosomal RNA (ssu rRNA) is the molecule of choice for comparing organisms across large evolutionary distances. 4) Upon what assumptions and data is the 3-domain “Big Tree of Life” based? Is this a valid approach to develop a phylogenetic tree? Explain why or why not. 5) What is the main problem with comparing the Big Tree of Life with the fossil record? Part II. Overview of Microbes 6) Size defines microbial life! Fill in the approximate values for each of the following: Viruses range from about ____________ to __________ . in size A typical bacterium is about ____________ Bacteria range from about ____________ to __________ . in size Eukaryotic cells range from ____________ to __________ . Your naked eye can see something about __________ in size. 7) Describe the difference between a “virus” and a “virion”.
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SQ02_Lect_4_6 - BioMI 290 2/1/08 Study Questions #2...

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