BIO 1130 Lecture Notes - Lecture 7: Panspermia, Escherichia Coli, Archaea

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Would have had to have been archaea to withstand harsh conditions. This tree cancels out possibility of panspermia b/c would not have been the right ancestor. We thought there were all the same, but really there is a variety of variations. Severe can cause permanent damage to body or death, less severe can cause a person to be sick (meat) Look the same but genetic systems make completely diff protein compositions in cell walls and flagella. Numbering system is how we tell them apart. As cell grows the volume grows faster than the surface area. To many contents w/in cell for the surface area to keep up with the rate of diffusion that is necessary. Since bacterial cells are so small, surface area is large enough to support the cells functions. Genetic material is just coiled on itself, single stranded no chromosome (point mutation will be expressed, there is no masking) Absence of nuclear envelope characteristic of prokaryote.