BIOL108 Lecture 4: Topic 4.docx

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Richard Moses

Document Summary

Topic 4 key events in the history of life. The end of the mesozoic era 65 million years ago cretaceous extinctions: when the dinosaurs get wiped out, 2) diversifications or radiations. Continental drift (general patterns: 3) periods (for above events, 4) any other info covered in class. N-fixing nodules in legumes: e. g. there are 200-1000 species in your guts. Some are helping you, but some may not be benefitting you at all: e. g. Obese individuals have different bacterial communities: very efficient calorie extraction. Leptin deficient: organisms might shut down leptin, preventing the turn off message for appetite, e. g. bioluminescent bacteria and deep sea fish. Organisms use an enzyme called lumicifen to produce light energy: prokaryotes are metabolically diverse, modes of nutrition, carbon source. Chemical chemo()troph: humans are chemoheterotrophs, the chemical energy can be organic or inorganic, prokaryotes are the only organisms that can get their energy from inorganic chemicals, table 27. 1.