LQB186 Lecture Notes - Lecture 6: Amphiphile, Symbiogenesis, Lipophilicity
9 Aug 2018
School
Department
Course
Professor
Document Summary
They belong to the kingdom monera and have been further classified into two distinct domains: Prokaryotes are organisms whose cells lack a nucleus ("pro" = before ; "karyon" = nucleus) Archaebacteria found in extreme environments like high temperatures, salt concentrations or ph. Eubacteria traditional bacteria including most known pathogenic forms ( e. coli, s. aureus) Prokaryotic cells will typically contain the following cellular components: Cytoplasm internal fluid component of the cell. Nucleoid region of the cytoplasm where the dna is located (dna strand is circular and called a genophore) Plasmids autonomous circular dna molecules that may be transferred between bacteria (horizontal gene transfer) Ribosomes complexes of rna and protein that are responsible for polypeptide synthesis (prokaryote ribosome = 70s) Cell membrane semi-permeable and selective barrier surrounding the cell. Cell wall rigid outer covering made of peptidoglycan maintains shape and prevents bursting (lysis) Slime capsule a thick polysaccharide layer used for protection against dessication (drying out) and phagocytosis.
