BIOL108 Lecture Notes - Lecture 9: Golgi Apparatus, Cyanobacteria, Archaea

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Radiometric dating continued the ratio of c14 to n14 will gradually reduce once the accumulated c14 in an organism starts to decay at the time of death therefore the older the sample, the less c14 will be left. Prokaryotes: first life first fossil evidence of their existence on earth dates back to ~3. 5 bya. Rock-like structures composed of layers of bacterial mats and sediments. Can also live in places that eukaryotes cannot. No nucleus - diffuse, circular ring of dna not enclosed by membrane; naked dna. Has plasmids - small rings of dna containing a few extra" genes. No membrane-enclosed organelles (e. g. mitochondria, golgi apparatus, the er, etc. ) Evolved independently in the 3 domains; means that they are analogous structures. Most of them are modified from other proteins w/ different functions (e. g. secretory system, ion transport, etc) Bacterial flagellum evolved from ancestral proteins that served other functions limited by diffusion.