BIOA01H3 Lecture Notes - Thermophile, Crenarchaeota, Microorganism

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Bebhinn Treanor

Document Summary

Not well known some features of bacteria with eukaryotes live in very harsh conditions. Cell structure cell wall cell membrane capsule pili flagella nucleoid plasmids ribosomes lack organelles with membrane similar to cytoskeleton. Polymer of modified sugars cross linked by short polypeptides. Cell stained with crystal violet, then iodine =purple positive and no lps. Cells rinsed with ethanol and stained with safranin = pink negative and has lps. Protects bacteria from external environment: desiccation, extreme temperatures, invading viruses, antibiotics. Aids attachment to host surfaces: required for colonization and required to initiate formation of a biofilm. Conjugative sex pilli allow transfer plasmids between bacteria. Prokaryotes and eukaryotes differ in protein composition, structure, mechanism of propulsion. Genome single circular dna , packed into nucleoid region smaller rings of genes called plamids plasmids resistance to antibiotics replicated independently. Archaeal bacteria has similarities with eukaryotic ribosomes, not sensitive to antibiotics. Mechanism promoting genetic diversity: rapid reproduction and mutation, genetic recombination & transfer.