BIOL107 Lecture Notes - Lecture 2: Nuclear Membrane, Eukaryote, Peptidoglycan

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL107
• Professor: Frank Nargang

Document Summary

Uses molecular data, compares dna and/or protein sequences from different organisms. Cladogram common ancestor, clear branches; one lineage diverged into bacteria and the other split into eukarya and archaea (implies closer relationship between eukarya and archaea than bacteria) Ring/tengled network no common ancestor, dna exchanged in early evolution by fusion of organisms, uptake of dna by dead organisms, infectious elements. Bacteria no nuclear membrane, form a nucleoid (dense compact region in cell), circular chromosomes, cell walls with peptidoglycan, usually single-celled (e. coli, salmonella) Archaea same as bacteria but no peptidoglycan in cell wall, can survive extreme conditions (high salt, high temperature) Eukarya nuclear membrane bound nucleus around dna, linear chromosomes. Cytoskeleton for shape, organization structure, membrane-bound structures called organelles.