BIO230H1 Lecture Notes - Bacteria, Archaea, Cell Membrane
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BIO230H1 Full Course Notes
Verified Note
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Document Summary
Tree of life: living organisms can be organized into 3 main branches and 2 cell types. The 3 main branches are eubacteria, archaebacteria, and eucaryotes. Eubacteria are what we traditionally refer to as bacteria. It is believed that they diverged from the eubacteria group along the same time as eucaryotes did. The way they handle their genome is more similar to eucaryotes than to eubacteria. The 2 cell types are prokaryotes and eukaryotes. Eubacteria and archaebacteria are included in this group. They can form communities, and often these communities are held together by sticky polysaccharides and sugars, known as biofilms. This makes it hard to get rid of and break because biofilms are very protective. Prokaryotes are surrounded by a sugar coat made out of protein-sugar complexes called a cell wall that is outside the plasma membrane. The plasma membrane encloses a single compartment that encloses the dna, rna, and proteins; the plasma membrane is selectively permeable to certain substances.
