BSC 2010 Lecture Notes - Lecture 38: Last Universal Common Ancestor, Precambrian, Cambrian Explosion
19 Apr 2016
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The history of life on earth: part 2. Diagram the relationships among the major domains of life. Explains the origins of the eukaryotes and their organelles, and discuss the origins of multicellularity. Give approximate dates for some of the major events and transitions in earth"s history. Life consists of three domains that share a common ancestor: luca last universal common ancestor, the three domains branch off from the luca. All organisms have: plasma membranes and ribosomes, metabolic pathways. Ex) glycolysis: semiconservative dna replication, dna that encodes proteins. These shared features indicate that all life is related: monophyletic. Prokaryotes differ from eukaryotes in a number of major ways: bacteria and archaea are prokaryotes, but phylogenies based on rrna genes suggest that archaea is more closely related to eukaryotes than prokaryotes. 4. 6 billion to 542 million years ago: most of the history of earth is in this time period. First life on earth was about 3. 8 billion years ago.
