section_11_key - Questions for Duscussion section 11 Name...

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Questions for Duscussion section 11 Name___________________ n.b. on P. 94 of the Doolittle paper, there is a comment that cytoskeletal genes are unknown in the Bacteria and Archaea; this paper is from 2000, and the Bacterial homologs of actin and tubulin weren’t recognized as such until later. 1. The idea of there being a “Last Universal Common Ancestor” (LUCA) from which all modern life is descended is supported by the ssu rRNA tree of life. W. Ford Doolittle would a) agree that there was a single LUCA; the evidence provided by phylogeny of other genes supports this. b) say there was a single LUCA; however, it lived only about 2 billion years ago, not 3.6 billion years ago. c) insist that there is no rational way to describe the relationships or ancestry of modern organisms d) argue that rather than a single LUCA 3.7 billion years ago, there was a large and diverse community within which there was free lateral transfer of genes. This is the point of the last figure in the paper. 2. The branching pattern of the ssu rRNA tree of life (the one on page 93, or the one shown in lecture) represents
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