BIOL108 Lecture Notes - Lecture 12: Chloroflexus Aurantiacus, Mitosis, Thylakoid

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Trevor Pasanen

Document Summary

Topic 4: key events in the history of life. Atmospheric oxygen and the origin of eukaryotes. Covers material to end of thursdays lecture. In quotations because they are a paraphyletic group. Prokaryotic life only for 1. 5 billion years. 6500 species are currently described based on phenotype. Genetic information is not nuclear enclosed (dna in the nucleoid) Most are unicellular text (p. 596) says all are, but that can be argued against. Others form sophisticated biofilms with cell to cell signaling and cellular differentiation. Many consider cells that form biofilms to be multicellular. Have plasma membranes and cell walls, but there are no membrane enclosed. Some species have specialized plasma membrane infolding organelles and no nuclear membrane. Photosynthetic thylakoid membranes in photosynthetic prokaryotes (such as cyanobacteria) 1 double stranded circular chromosome have a form of transform information) Prokaryotes have no mitosis or meiosis (they do not reproduce sexually, however they. Reproduce through binary fission reproduction (cell division) without sex .