Читать книгу Principles of Microbial Diversity - James W. Brown - Страница 39

1 1. Can you think of a positive trait (i.e., something that is present or has a positive characteristic) that is typical of bacteria but not eukaryotes?

2 2. Can you think of a positive trait that is characteristic of protists but not higher eukaryotes? What is a “higher” eukaryote? Why? Would you still think this if you were an egocentric trypanosome?

3 3. What is the difference between a multicellular organism and just a lump of cells of the same species?

4 4. For how many of the groups shown in the three-kingdom molecular phylogenetic tree can you name species?

5 5. In the molecular phylogenetic tree shown above, how would you add a novel organism whose ancestors diverged from other living things before the last common ancestor of the Bacteria, Archaea, and Eukarya?

6 6. Where is the last common ancestor of all known bacteria?

7 7. Which modern organism(s) is closest in evolutionary distance in this tree to the last common ancestor?