BIOL108 Lecture Notes - Lecture 10: Ecological Relationship, Nuclear Membrane, Cell Membrane

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

Document Summary

Ecological relationships: symbiotic: 2 species cohabitate and have often, if not obligatory contact with each other. Mutualism, commensalism, parasitism: many prokaryotes are endosymbiotic (live within) Let a be a host, and b be the non host. + (0: when lots of oxygen accumulate in the earth"s atmosphere, cyanobacteria that were photosynthetic used energy from the sun to split h2o into molecular oxygen and hydrogen. O2 was actually toxic to most early life. Rotting oxygen-free substrates; some colonized guts, environments that have no oxygen. However, others began to undergo aerobic respiration: diversification of eukaryotes. Around ~2 bya, eukaryotes evolved and started to use the oxygen. This increased the complexity and structural diversity, especially in eukaryotic cells (mitochondria, membrane bound organelles, etc. ) Domain eukarya: contain linear dna chromosomes in membrane bound nucleus, developed membrane bound organelles. Eg. mitochondria, chloroplasts (aka plastids: bigger than the proks, cytoskeleton was highly evolved, meaning the eukaryotic morphology was increasing!